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99 chevy s10 4.3 w won't start

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Old 12-13-2010, 01:07 PM   #1
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99 chevy s10 4.3 w won't start

I had a problem starting 2 weeks ago. I finally got it started after jumping it and cranking forever. I replaced the map sensor because it was giving me a map code. I also changed the wires. It ran good for 2 weeks with no codes. I had the check engine light come on 3 days ago and had the code checked at autozone and it is multiple misfire. I did not use the truck on Saturday or Sunday. It snowed Sunday. I went out Sunday night to clean it off and warm it up, and it won't start. I sounds like it is going to start usually when i let off on the key. It also backfired really loud last night.

I tried to start it this morning with no luck. I bought a new cap and rotor from gm dealer. I replaced those and checked the fuel pressure. I am getting around 55 psi. I did not check while I was cranking. It would not start with the new cap/rotor. I had a loud backfire after cranking for a while. I have read a lot of the posts on here and don't want to buy all new sensors trying to fix. It also sounds like the catalytic converter might be plugged. I might have to cut it out and straight pipe in its place.

Marty

Any ideas out there
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Old 12-13-2010, 01:11 PM   #2
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Re: 99 chevy s10 4.3 w won't start

If you think it's the O2 sensors, then remove the 2 before the convertor and try to start it.
Before you do that, unplug your MAF sensor and try to start it.
Old 12-13-2010, 01:34 PM   #3
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Re: 99 chevy s10 4.3 w won't start

Your fuel pressure is good.


-What do the plugs look like?
-Have you changed the fuel filter?
-Take your EGR off and see if its clogged?
-Have you recently changed anything prior to it running poorly?
-How long has it been since you changed your wires? Plugs?
-Change your PCV valve and either plug or check to see if the vaccum line under your TB tube needs to be replaced.
-Check your air filter box make sure theres not something stuck in it?
-Does it run off starting fluid?

Well start there.
Old 12-13-2010, 10:23 PM   #4
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Re: 99 chevy s10 4.3 w won't start

Unplug MAF, retry starting.

Check Crank sensor (CKP) on the front of the motor for damage/ etc.
Old 12-14-2010, 12:27 AM   #5
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Re: 99 chevy s10 4.3 w won't start

-What do the plugs look like? installed new ones
-Have you changed the fuel filter? new air filter
-Take your EGR off and see if its clogged? egr looks ok and rattles
-Have you recently changed anything prior to it running poorly? no
-How long has it been since you changed your wires? Plugs? new wires and plugs

-Change your PCV valve and either plug or check to see if the vaccum line under your TB tube needs to be replaced. vaccum tube looks good

-Check your air filter box make sure theres not something stuck in it? not blocked

-Does it run off starting fluid? have to get some.

I warmed up the garage and changed the fuel filter. new wires, cap, rotor, plugs. checked the pcv, changed the air filter. I will check the crank sensor tomorrow.

I have to get a new muffler because when it backfired it blew it apart.

Old 12-14-2010, 12:56 PM   #6
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Re: 99 chevy s10 4.3 w won't start

I pulled the front o2 sensors last night and tried to start and no luck.

I tried to start it this morning and it started. it took about 10 seconds or so and it sounded pretty good. It was loud because of the o2's out and the muffler is blown apart from the 2 backfires. I am going to put the o2 sensors back in after work and get a new muffler installed. I will have to see how it runs.
Old 12-14-2010, 01:27 PM   #7
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Re: 99 chevy s10 4.3 w won't start

Quote: Originally Posted by mightyfone
-What do the plugs look like? installed new ones
-Have you changed the fuel filter? new air filter
-Take your EGR off and see if its clogged? egr looks ok and rattles
-Have you recently changed anything prior to it running poorly? no
-How long has it been since you changed your wires? Plugs? new wires and plugs

-Change your PCV valve and either plug or check to see if the vaccum line under your TB tube needs to be replaced. vaccum tube looks good

-Check your air filter box make sure theres not something stuck in it? not blocked

-Does it run off starting fluid? have to get some.

I warmed up the garage and changed the fuel filter. new wires, cap, rotor, plugs. checked the pcv, changed the air filter. I will check the crank sensor tomorrow.

I have to get a new muffler because when it backfired it blew it apart.

Not air filter Fuel filter.

EGR rattling? I think your reffering to the PCV valve the EGR is the thing the size of a small oil filter on the front of your intake manifold with an electrical plug in the top of it.

What brand are the plugs?

Were the spark plug wires pre assembled or did you have to make them?

You also listed an aweful lot of new parts for having no as an answer to did you change anything prior to it not starting? Did you change all these parts after it broke?

Try starting fluid just a little.
-Crack the neck off of the TB open the tb spray about a one one thousand into it close the neck and put the wingnut on real quick then try to start, dont leave the iat and maf hangin.
Old 12-15-2010, 12:05 AM   #8
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Re: 99 chevy s10 4.3 w won't start

MAF can be electrically disconnected if leaving the hat off the TB....
Old 01-01-2011, 09:32 PM   #9
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Unhappy Re: 99 chevy s10 4.3 w won't start

Truck won't start again tonight. I am thinking of changing fuel injection module.

I have replace the cap, rotor, (from GM), wires, plugs, fuel filter, air filter, muffler (blew the last one up with a backfire).

I have checked the fuel pressure while cranking.

I think a fuel injector is leaking, I loose pressure pretty quick after i turn the key off.

Any Ideas out there.
Old 01-02-2011, 12:09 AM   #10
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Re: 99 chevy s10 4.3 w won't start

Were any of the plugs wet or getting really black?

Hows the little module by the coil check out?

Does it try to start?

Have Fire? Check the CKP sensor in the front cover of the motor.
Old 01-02-2011, 03:55 PM   #11
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Re: 99 chevy s10 4.3 w won't start

It trys to start sometimes when i turn the key and sometimes when i let go of the key. I did not check the plugs last night to see if they were wet. I just went out to the garage and it started right up. I took it for a 15 minute ride to warm it up. It ran fine. it misses a little bit. It was humid and rainy friday and saturday. I had not drove it since tuesday.

I am going to take it up to autozone to have the codes checked.
Old 01-02-2011, 08:06 PM   #12
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Re: 99 chevy s10 4.3 w won't start

Might look into ignition, cap/ rotor/ etc.....
Old 02-07-2011, 03:27 PM   #13
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Re: 99 chevy s10 4.3 w won't start

Truck won’t start again. I have replaced the fuel injector spider, cap, rotor, wires, plugs, map sensor, pcv valve, vacuum lines and fuel filter. It fired a few times yesterday but would not start. I have 61 psi while cranking. I check the left front cylinder for spark and it was good. I took the egr off and cleaned it. It looks like it is working ok. I am really frustrated with this truck. Any time it sits for more than a day and cold and wet. It won’t start. I am ready to have a shop take a look at it. I am going to try some starting fluid when I get home tonight.

Any ideas?
Old 02-07-2011, 04:14 PM   #14
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Re: 99 chevy s10 4.3 w won't start

Try the fluid, if that fires it is a fuel issue, inspect harness (also a check of the injector circuits for shure).

Have you tested the CKP sensor? (someone help me out doesnt this also control spark too?)
Old 02-07-2011, 05:14 PM   #15
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Re: 99 chevy s10 4.3 w won't start

I did not mess with the crank position sensor. i am going to try the fluid when i get home. It is just weird that it runs fine and never dies on the road. The only time it won't start is when it sits for at least a day is is rainy or snowy out.
Old 02-07-2011, 05:22 PM   #16
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Re: 99 chevy s10 4.3 w won't start

CKP causes intermittent issues for some people......
Old 02-07-2011, 06:50 PM   #17
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Re: 99 chevy s10 4.3 w won't start

Probably the pump.
Old 02-09-2011, 11:02 PM   #18
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Re: 99 chevy s10 4.3 w won't start

Did you try the starting fluid?
Old 02-10-2011, 01:03 AM   #19
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Re: 99 chevy s10 4.3 w won't start

Does it even have spark coming from the coil? if it does not or it is weak check the Crank position sensor I have the same year it did the same exact thing. Try taking it out and cleaning it then put it back in. If that does not work it might be completely bad if it is getting voltage and your not getting spark.
Old 02-10-2011, 04:09 PM   #20
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Re: 99 chevy s10 4.3 w won't start

Cleaning the crank angle sensor will do nothing lol. All it is is a plastic case on the outside of an electromagnet often it wont throw a code, it is pretty common tho should be looked at if your sure you dont have spark... Pretty easy to tell if you have spark though from this situation because if your crank angle sensor is bad you wont get any spark period, what is your fuel pressure?
Old 02-11-2011, 01:05 PM   #21
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Re: 99 chevy s10 4.3 w won't start

any luck?
Old 01-20-2012, 12:16 PM   #22
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Re: 99 chevy s10 4.3 w won't start

if you are loosing pressure with key off the regulator is bad! should hold pressure indefinatly. new one is $50 and located under back of throttle body under plastic plenum.install a new filter sreen with the regulater while your there.
Old 05-07-2014, 01:20 PM   #23
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Re: 99 chevy s10 4.3 w won't start

im going threw the same problem right now,just cranks over no start,put a little gas in motor starts right up.let me know if you find the trouble
Old 05-07-2014, 02:33 PM   #24
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Re: 99 chevy s10 4.3 w won't start

Quote: Originally Posted by roger6632
im going threw the same problem right now,just cranks over no start,put a little gas in motor starts right up.let me know if you find the trouble
If it starts with gas down the throttle body, then its a fuel pressure problem.
Test the fuel pressure.
Old 05-07-2014, 02:59 PM   #25
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Re: 99 chevy s10 4.3 w won't start

At least put some gas down the throttle body and try to start it so you know if it's fuel or ignition!

You need to establish this before you are jumping all over, try thi, try that.
Old 05-07-2014, 06:04 PM   #26
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Re: 99 chevy s10 4.3 w won't start

Just to clarify my above post (was on my phone).

You need to narrow this down to an ignition problem or a fuel problem. You don't want to go jumping around, replace this part, check this sensor kinda thing. wastes time and money.

Pour some gas down the throttle body, just an ounce or two. You don't need starting fluid. Do this and try to start it. If it fires up and stalls, you know that you have spark but no fuel. So you can go in that direction.

If it doesn't fire up briefly, then you need to check for spark, it should have fired up for a bit or backfired or made some noise like it was trying. Pull a plug wire off and stick an insulated screwdriver into the plug end. Hold the shaft about a 1/4" from a metal ground and have somebody crank it over. A good ignition should have a nice blue spark with a good snap.

Start with these two simple checks and go from there. After we know if you have no spark or no fuel we can offer more help. Otherwise we are all just guessing, that just wastes your time and ours.
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