my new "Wait4me performance" PCM...

[Family Man]

Quote: Originally Posted by FraserFishin'

........Any ideas on the speedo and ABS thing? How should I fix these?

Both are related and will be cured with a single fix.

S-Truck ABS is a three channel ABS system with a speed sensor on each front wheel, and a third (rear left and right combined) sensor in the transmission. Tire diameter and rear-end ratio are stored in the PCM; the PCM does the calculation to actual rear wheel speed (average of left and right rear), then sends that signal to the ABS computer which compares rear wheel speed to front left and right. That same PCM signal is used by the speedometer to electronically indicate speed (no mechanical speedo cable).

My guess is Jesse either goofed (a simple typo would do) on the tire diameter or rear-end ratio entry; or there's an erroneous entry related to Km/Hr (versus MPH). This is causing the PCM to calculate/send a rear wheel speed much greater than true speed; the ABS computer faults due to too big a speed descrepancy front to rear; and the speedo reads way high.

Solution: send it back to W4M; Jesse will make it right. With the volume this guy seems to be doing, I'm not surprised by the occasional mix-up/mistake.

Good luck,

James

[King_Ice_Flash2]

Quote: Originally Posted by 99,4.3vortec

ok i called today and talked with jesse i take it?...he told me two things i was surprised about...one, that a 99 dosent have torque man.(only 2001 one and up)...he said it has nothing to do with the way it shifts...said that that was the line pressure.....two, that i do not have to have a crank relearn b/c i have a distributor....sound right to yall???

Close, but the distributor has nothing to do with the crank position variation relearn.

[99,4.3vortec]

so do i need the relearn??...he said i didnt....

[Bruizer]

I went and had my relearn done today. Didn't take too long, went through the motions of starting it, letting it idle, reving it to whatever RPM, then shutting off and repeating 2 more times or so. Didn't really notice a difference after having it done, but then again today was only my second day driving with the new PCM. The guy at the shop didn't even charge me anything. I asked how much and he said nothing and I asked if he was sure and he said not to worry about it, just if any lights came on or anything went wrong to bring it back. I told him thank you and greatly appreciate it but now I feel bad, I should have given him somethin' for his time even though he said not to even worry about it. At any rate though he said it wasn't throwing a code from it or anything to begin with, but he told me that after he did it.

[King_Ice_Flash2]

It might be a 01+ feature, but I am not sure.

[blacksharpie]

Line pressure has a lot to do with shift feel, If I recall it was 2001+ up with TM.

[FraserFishin']

Hannah was gonna check about his entries about tire size, she mentioned maybe my gears are not stock. Stock in a Zr2 is 3:73 I believe. What gear ratio would throw it off like 70 km/h?

[Bruizer]

Quote: Originally Posted by FraserFishin'

Stock in a Zr2 is 3:73 I believe.

You are correct.

[marduk]

Sorry to hijack, but I can't seem to get a hold of Jesse. Is the number that's listed on his website current?

Please let me know because I'd really like to order a PCM today.

[MikeInCtown]

I talked to him last week and someone who works with him replied to an e-mail yesterday. I'd try again maybe in an hour or two.

BTW, can anyone in the Cleveland area point me to someone who can do the crank relearn on our trucks? -OBDII I'm still trying to decide on sending the stock PCM or getting an extra and don't want to have a truck sitting there that runs like crap while I get stuck paying someone an hour of labor for 5 minutes of work. Want to line up everything so I don't have any problems.

[Yogi]

Maybe TM has changed but there are some settings under TM on my '98. See attached screen shot.

[marduk]

Quote: Originally Posted by MikeInCtown

I talked to him last week and someone who works with him replied to an e-mail yesterday. I'd try again maybe in an hour or two.

Thanks, I got a hold of Hannah I think, anyway it's ordered and should have it next week sometime.

[99,4.3vortec]

i ordered mine this morning...about how long does it take to get to ya?...i did the new pcm for $160

[brent769]

Is there anything to worry about on the transmission (automatic) if the line pressure is increased by a tune? Should I have a shift kit installed? I was planning on getting a new PCM from wait4meperformance with my stock trans. and adding a vette servo down the road. Thanks, sorry for stealing the thread.

[Merritt]

Quote: Originally Posted by 99,4.3vortec

i ordered mine this morning...about how long does it take to get to ya?...i did the new pcm for $160

Mine only took about a week, it'll prolly get there soon.

[99,4.3vortec]

Sweet.

[Yogi]

Click here for another satisfied customer. (Posted in the Blazer/Jimmy section)

[sparky2613]

nice! cant wait to do this

[xlr8]

I too will be doing this. I want to wrap up some of the other mods before I purchase. I figure the more the map matches my mods the better. I know he retunes for free but I am in no real hurry. Total mods will be.

2.5" Y pipe
2.5" Catback with Flowmaster 40
CAI
TB Mod
Electric Fan
Lightweight Pulley's

I am anctious to see how the truck reacts to the mods with the PCM retune.

I will be having it tuned for 93. I know it's pricey but if the mpg's work out it should be around the same.

It was stated earlier in the thread that the PCM will adjust regaurding the octane you put in the tank. However, they do request the octane usage for a reason. Anyone regretting the 93? I know gas is getting pricey.

[raider600]

Lightweight pulleys? Do you mean under drive Pulleys? Lightweight wont do anything for you.

[Bruizer]

Quote: Originally Posted by raider600

Lightweight pulleys? Do you mean under drive Pulleys? Lightweight wont do anything for you.

Actually it would but the difference would probably never be noticeable. The lighter the pulleys the less the engine has to work to turn them. But like I said, the difference would never be noticeable when it comes down to how small the pulleys are and whether you could actually make it that much lighter by goin' from steel to aluminum.

[muckRunner]

Quote: Originally Posted by Bruizer

Actually it would but the difference would probably never be noticeable. The lighter the pulleys the less the engine has to work to turn them.

i agree, i got a set for mine that is about a 35% underdrive. billet aluminum crank, alt, and water pump pulleys, the wp pulley is the same size though but it weighs about half that of the steel pulley (and looks cooler ) so i put it on. that alt pulley was a to get off though without airtools

[FraserFishin']

Well had everything checked and the goof was on their end.
Have not had a email from them in the last few days so I hope my problem is not being avoided. I hope there is no fight over shipping costs.

[j894]

Quote: Originally Posted by marduk

Thanks, I got a hold of Hannah I think, anyway it's ordered and should have it next week sometime.

let us know how it is with the manual transmission.

Im curious to hear from someone who's done it with a manual, if its actually worth it.

[capspauld]

Quote: Originally Posted by j894

let us know how it is with the manual transmission.

Im curious to hear from someone who's done it with a manual, if its actually worth it.

x2, I would like to do it but havent heard from many with manual to know if its as worth it as the auto.

[raider600]

I have a manual. But i used PCMforless.com. W4M is about an hour or so north of me. Once I get a day off work I will go up there and get a re tune.

[capspauld]

Quote: Originally Posted by raider600

I have a manual. But i used PCMforless.com. W4M is about an hour or so north of me. Once I get a day off work I will go up there and get a re tune.

Did you notice much difference with the pcmforless one?

[marduk]

Well it's been a week and I still don't have it, I will definately let you all know how it works with a manual when it comes in.

[Merritt]

Quote: Originally Posted by marduk

Well it's been a week and I still don't have it, I will definately let you all know how it works with a manual when it comes in.

dude, i love your blazer, haha

[marduk]

Quote: Originally Posted by Merritj2417

dude, i love your blazer, haha

Thanks!

Well when I got home from work yesterday there was a box on the porch, sure enough it was my new PCM. I guess I should list my mods that it was tuned for: Airaid Quickfit intake, throttle plate mod, Magnaflow muffler, 180* t-stat and 93 octane.

The install was easy, just two 7mm screws hold the wire connection to the PCM, and PCM itself is just snapped down in it's holder. It definately makes more power now, the whole power band just feels stronger, especially in higher RPMs. Before when I set my cruise at 60 MPH, my tach would read just above 2,000 RPMs, now it's just below 1,800. On my way to work this morning I checked the instant economy on my overhead council and it was consistantly 2-4 MPGs higher than usual as well, but I guess the real test will be a whole tank of gas.

Also the top speed limiter was either bumped up or removed. I went for a top speed pull and I gotta say it was weird to see the speedometer go past 95, I took it to 100 and backed off (I'm pretty sure A/T's aren't made for high speed ). All in all I think it's worth the money, I'm sure it's more noticeable in autos with the higher shift points, but I can feel a difference even with the 5 speed.

[capspauld]

Sweet candy, thats what I like to hear!! Thanks a lot for the update, do you think you could update on the MPG findings after a tank?? That is what I am most interested in.

[marduk]

Oh yeah I should also mention that it did turn my SES light on, sometimes it flashes too, I'm guessing that it will go off when I do the crank relearn.

[MikeInCtown]

If you sent in your own unit it shouldn't need a re-learn unless he erased all that info.

[marduk]

I kept my original unit, can't have the down time with my daily driver.

[MikeInCtown]

That could explain the codes then. Do the relearn on your engine.


I ordered a replacement from a boneyard so I could do the same thing. Cost $17.95. Problem is, the service # does not match my existing, but the PCM is for the right year and engine. Since I am sending it to be re-programmed, is this alright?

[BlazinKC25]

I have read most of this topic and am very interested in having this done. But here is my issue. I just bought my s10. It is a 94 4.3l CPI eng w/ a 4l60e trans. I am thinking maybe the previous owner may have done something to the ECM already. Reason being is if I floor it when it shifts 1-2 it will chirp pretty good.

So I guess my question is do most stock 4.3s chirp from 1-2 or do you think something has been done. Mods to my knowledge are CAI,no cat and flow master muffler. Other than that I don't think anything has been done. Also I work for a GM dealer and by VIN my truck had 3.43 gears in it. I run about 2300-2500 rpm at 70. Does this sound about right for 3.43's or is there any way of find out if they have been changed?

I do know I don't have posi due to many 1 wheel peels . Thanks in advance for any input. It will be a bit till I have the funds to do this but just figured I would see what you all had to say.

Thanks, Kyle

[sparky2613]

Quote: Originally Posted by BlazinKC25

I have read most of this topic and am very interested in having this done. But here is my issue. I just bought my s10. It is a 94 4.3l CPI eng w/ a 4l60e trans. I am thinking maybe the previous owner may have done something to the ECM already. Reason being is if I floor it when it shifts 1-2 it will chirp pretty good.

So I guess my question is do most stock 4.3s chirp from 1-2 or do you think something has been done. Mods to my knowledge are CAI,no cat and flow master muffler. Other than that I don't think anything has been done. Also I work for a GM dealer and by VIN my truck had 3.43 gears in it. I run about 2300-2500 rpm at 70. Does this sound about right for 3.43's or is there any way of find out if they have been changed?

I do know I don't have posi due to many 1 wheel peels . Thanks in advance for any input. It will be a bit till I have the funds to do this but just figured I would see what you all had to say.

Thanks, Kyle

He might have put a B&M Shift kit ($35.00) in it, Thats what i have and it chirp 1-2..


Thats what my RPM is at 70 and i think i have 3.43, and mine is stock so ill have to check What gear im running

[BlazinKC25]

I am assuming that there is no real way to tell for sure with out getting into the trans? Also if I am reading correctly my 94 does not have any TM system? Is this correct? If so do you think the ECM upgrade is still worth the price?

Thanks, Kyle

[sparky2613]

the only way to know is to pull the valve body and look for the added plug in the valve body plate

ECM upgrade, Y wouldn't it help?

its the same price as most of the chips ( $166.80 for a jet chip) for your year.

but jet chip cant tune for egr and 3rd o2 delete

and "Wait4me performance" will do a better job tunning it for your truck

[BlazinKC25]

It just seemed to me from reading this that most people thought the TM reduction was the most noticable inprovement. So if my truck does not have the TM system I didn't know other than MPG if I would see/feel any real inprovements with this upgrade. Anyway just wanted to ask. I need new suspension befor I worry about any other upgrades. So this will have to wait for now.

Thanks for the info, Kyle

[gchemist]

I'm the happy 4 door Jimmy driver.

Next on the list: high flow muffler this summer and electric fan if fuel prices keep going up.

[j894]

mine should be in this week or next, I'll report on my 5sp 4x4 as well.how noticeable if at all it is.

[Merritt]

Glad to hear that this is working out for everybody. Inprogress, did you ever get your situation figured out?

[Destin]

Quote: Originally Posted by BlazinKC25

It just seemed to me from reading this that most people thought the TM reduction was the most noticable inprovement. So if my truck does not have the TM system I didn't know other than MPG if I would see/feel any real inprovements with this upgrade. Anyway just wanted to ask. I need new suspension befor I worry about any other upgrades. So this will have to wait for now.

Thanks for the info, Kyle

I too have the 94 cpi and when I inquired with Jesse about a tuning, he informed me that he isn't burning EPROMs for OBD1 anymore, so he can't help us. Oh well.

We don't need him anyway.

[Yogi]

Quote: Originally Posted by Destin

I too have the 94 cpi and when I inquired with Jesse about a tuning, he informed me that he isn't burning EPROMs for OBD1 anymore, so he can't help us. Oh well.

We don't need him anyway.

Try TBICHIPS.Com

[BlazinKC25]

Quote: Originally Posted by Destin

I too have the 94 cpi and when I inquired with Jesse about a tuning, he informed me that he isn't burning EPROMs for OBD1 anymore, so he can't help us. Oh well.

We don't need him anyway.

Well guess I won't be getting one then. Thanks for the info.

Kyle

[BlkBlzr01]

whats up guys? i am still debating if i wanna get this tune done, but i have another serious question. i have always hated the acceleration in my blazer. well, today i learned that i have 3.08's. i probably should't expect much with this tune since im having to tug along on 31's. they aren't helping my case i know, but can i expect to see any real difference unless i change ratio's to 3.73's?

[gchemist]

Gas milage improvement is mostly from locking the torque converter. Locking the torque converter above 45 MPH saves 200-300 RPMs.

My Jimmy could run for miles without locking up. Even with the tranny hot. GM for some reason really put in loose converters. I would have to slow down and speed up slowly to get it to lock. After the PCM reprogramming. The torque converter locks shortly after OD.

[j894]

Quote: Originally Posted by little-ten

whats up guys? i am still debating if i wanna get this tune done, but i have another serious question. i have always hated the acceleration in my blazer. well, today i learned that i have 3.08's. i probably should't expect much with this tune since im having to tug along on 31's. they aren't helping my case i know, but can i expect to see any real difference unless i change ratio's to 3.73's?

It probably won't do much for you. Those gears and tires together make for one dog of a truck. I had 3.08s with 29" tires (235/75r15s) on my old truck and it was horrible, biggest ****ing slug. It was a '93 and i was able to adjust/advance the timing for better fuel, but you couldnt tell much when it was done. The tires and gears killed it. You need smaller factory size tires and or different gears., it will probably feel like a whole new truck just with that. Even if you get 3.73s, 31s are big and heavy tires. Have you considered getting anything smaller or closer to stock?

[BlkBlzr01]

Quote: Originally Posted by j894

It probably won't do much for you. Those gears and tires together make for one dog of a truck. I had 3.08s with 29" tires (235/75r15s) on my old truck and it was horrible, biggest ****ing slug. It was a '93 and i was able to adjust/advance the timing for better fuel, but you couldnt tell much when it was done. The tires and gears killed it. You need smaller factory size tires and or different gears., it will probably feel like a whole new truck just with that. Even if you get 3.73s, 31s are big and heavy tires. Have you considered getting anything smaller or closer to stock?

yeah, its a slug for sure and thats an understatement. this thing can barely get out of its own way. if i would have known about the gears before now i would have never lifted it or put the new 31's on it. of course, i haven't really understood the whole gearing thing until recently anyway. i guess it may be worth a try.