Hard Start 92 2.8 Tbi - S-10 Forum
 
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post #1 of 7 Old 10-26-2009, 07:00 PM Thread Starter
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Hard Start 92 2.8 Tbi

I have a 92 2.8 TBI, 5 Speed that has developed a hard start issue. I replaced the fuel filter thinking I may have a fuel flow issue - I couldn't remember the last time I replaced it so I figured it was time. I have to crank and crank and crank to get it to start. Sometimes if I hold the accelerator down it will try to start but won't. Sometimes after I get it to start if I blip the accelerator it will stall out. Sometimes when I start it it will run fine except that the SES light comes on. I need to disconnect the battery and clear the codes. I have experienced some extremely rich exhaust.

I have the following codes:
15 - Coolant Sensor Circuit Low/Open

34 - Map Sensor Signal Out of Range - Low

45 - Oxygen Sensor Rich Exhaust

If I can get it to run long enough to warm up and unplug the coolant sensor the idle will increase to that of a cold start.

I am not sure how to test the O2 sensor so I am not sure if it is good or bad but I am thinking that probably is not the problem.

Now the Map sensor, when I get it running and unplug the MAP sometimes it makes the engine speed up, sometimes it doesn't seem to make a difference.

Does anyone have any suggestions? I am thinking that i will buy a new MAP and give that a try. If there were problems with a sticking IAC would that cause these types of symptoms?

Has anyone else had these symptoms?

Thanks for looking,
Jeff


1992 S10 Extended Cab, 2.8, 5 speed - paid $50 for it 11 years ago - still running strong (as strong as a 2.8 can)
1995 Blazer, 4.3, Auto, 4x4 - Sold
1987 Porsche 944
1981 Porsche 924 Turbo
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post #2 of 7 Old 10-29-2009, 10:31 PM Thread Starter
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Re: Hard Start 92 2.8 Tbi

Update:

I pulled the IAC, cleaned and reinstalled - no difference.

I noticed that I have an injector that is not spraying the way it should, it appears like it is just dripping. I used a noid light and it appears that the injector is receiving the appropriate pulses. In order to further troubleshoot this issue, I swapped injectors and it made no difference.

Will low fuel pressure cause one injector to spray properly and the other to "dribble"?

Next step is to drop the tank and check the sock to see if it is restricting flow. Hard to say what I will find in the tank - hopefully it is not rusted and needing replacement.

1992 S10 Extended Cab, 2.8, 5 speed - paid $50 for it 11 years ago - still running strong (as strong as a 2.8 can)
1995 Blazer, 4.3, Auto, 4x4 - Sold
1987 Porsche 944
1981 Porsche 924 Turbo
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post #3 of 7 Old 11-01-2009, 08:32 AM Thread Starter
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Re: Hard Start 92 2.8 Tbi

Problem solved. I had a helper look to see if any fuel was spraying from the injectors when cranking, it was. Went to Autozone and bought a new coil. Turns out I didn't need it, the coil wire post on the coil was badly corroded; used a little sand paper to clean it up and now it is running well again - it even got rid of the slight miss I had.

So happy I didn't need to drop the tank.

1992 S10 Extended Cab, 2.8, 5 speed - paid $50 for it 11 years ago - still running strong (as strong as a 2.8 can)
1995 Blazer, 4.3, Auto, 4x4 - Sold
1987 Porsche 944
1981 Porsche 924 Turbo
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post #4 of 7 Old 10-14-2014, 01:20 PM
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Re: Hard Start 92 2.8 Tbi

Quote:
Originally Posted by 4pt9fiero View Post
Problem solved. I had a helper look to see if any fuel was spraying from the injectors when cranking, it was. Went to Autozone and bought a new coil. Turns out I didn't need it, the coil wire post on the coil was badly corroded; used a little sand paper to clean it up and now it is running well again - it even got rid of the slight miss I had.

So happy I didn't need to drop the tank.
I know this is an old post but does anybody know what coil he's talking about?
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post #5 of 7 Old 10-14-2014, 08:03 PM
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Re: Hard Start 92 2.8 Tbi

Plug wire post on the remote coil that follows a wire plugged into the middle of the dizzy cap

1985 2.8L V6 S10 completely restored with 65,000 miles on body, frame, and rear axle. Weber 38 DGES Powered SOLD

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post #6 of 7 Old 10-15-2014, 07:39 AM
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Re: Hard Start 92 2.8 Tbi

did you ever notice any thing else that coincided with the issue?
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post #7 of 7 Old 10-15-2014, 09:43 AM
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Re: Hard Start 92 2.8 Tbi

Quote:
Originally Posted by greasemonkeys10 View Post
Plug wire post on the remote coil that follows a wire plugged into the middle of the dizzy cap
Thanks
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