Stalling issue- Driving me crazy

PALLADIN72 · #1 08-01-2005, 04:08 PM

OK, I have searched the forum, I am new as of today, and I am still at a loss. I have a '92 S10 Blazer 4 x 4, 4.3 vin z. It starts fine in the morning. It loses idle immediately. It will stall if my foot is not on the accelerator when I come to a stop. Moving no problem, even if I do not have my foot on the gas. After it stalls, it will not restart. When trying to restart, I do not see any gas from jets. To restart I must hit it with starter fluid (yes I know a bad thing). It will start immediately and keep running as long as I have foot barely on accelerator. After it starts, jets look like they work perfectly.

When it first started, we thought it was a fuel issue. I have replaced fuel filter and fuel pump to no avail. I* looked at the egr valve, but not sure what to do with it. It seemed like it was working OK. This has gone on for two weeks now. The last mechanic said it would cost about $500 to figure a problem like this out and that I can not do right now. Please help or put me on the right path. I am not much of a mechanic, but some of the guys at work are helpful, but they are stumped. Thanks in advance.

Austin8214 · #2 08-01-2005, 04:43 PM

I would check your IAC or TPS.

BlazerLT · #3 08-01-2005, 05:43 PM

Do you have the VORTEC name plate on the top of your engine?

PALLADIN72 · #4 08-01-2005, 06:02 PM

Quote:

Originally Posted by BlazerLT

Do you have the VORTEC name plate on the top of your engine?

No Vortec name plate, just checked

BlazerLT · #5 08-01-2005, 11:26 PM

so you have the round air filter assembly?

PALLADIN72 · #6 08-02-2005, 01:33 AM

Quote:

Originally Posted by BlazerLT

so you have the round air filter assembly?

Yes, that is right.

BlazerLT · #7 08-02-2005, 01:54 AM

Check your battery voltage when the engine is running.

Check fuel pressure.

PALLADIN72 · #8 08-02-2005, 11:18 AM

Quote:

Originally Posted by BlazerLT

Check your battery voltage when the engine is running.

Check fuel pressure.

This morning rechecking everything again we noticed that a wire to the ECT was loose. We reconnected it and now the service engine soon light stays on. The code reader which had previously said everything was OK, now reads Code 15. Which is that sensor. I'm going to get a new one, I guess and see if that fixes the problem. Does that make any sense?

BlazerLT · #9 08-02-2005, 11:26 AM

15 is the engine coolant temperature sensor circuit high (low temperature indicated)

Is the temperature low on the gauge?

PALLADIN72 · #10 08-02-2005, 11:37 AM

Quote:

Originally Posted by BlazerLT

15 is the engine coolant temperature sensor circuit high (low temperature indicated)

Is the temperature low on the gauge?

Gauge reads normal. But it makes me think that since it starts fine in the morning when cool and as temp heats up it stalls that it is somehow related. I thought the sensor affected voltage to fuel sensor.

BlazerLT · #11 08-02-2005, 12:27 PM

You should also clean the PCM grounds.

That code sets if there is a low temperature detected for 30 seconds or if there is a circuit fault.

Austin8214 · #12 08-02-2005, 12:47 PM

Quote:

Originally Posted by PALLADIN72

Gauge reads normal. But it makes me think that since it starts fine in the morning when cool and as temp heats up it stalls that it is somehow related. I thought the sensor affected voltage to fuel sensor.

It does replace you temp sensor and you should be good to go.

PALLADIN72 · #13 08-02-2005, 01:12 PM

Quote:

Originally Posted by BlazerLT

You should also clean the PCM grounds.

That code sets if there is a low temperature detected for 30 seconds or if there is a circuit fault.

What are PCM grounds?

Also, just replaced ECT sensor. Engine light no longer an issue. Codes read normal now. Engine still stalls and wont restart without starter fluid.

PALLADIN72 · #14 08-02-2005, 05:46 PM

Quote:

Originally Posted by PALLADIN72

What are PCM grounds?

Also, just replaced ECT sensor. Engine light no longer an issue. Codes read normal now. Engine still stalls and wont restart without starter fluid.

So now I've replaced the ECT and it still stalls. So I replaced the IAC and it still stalls. It starts cold, but when it warms up, it stalls and no gas from jets. Until it stall, it runs fine. No codes. Runs fine if I keep my foot barely on the accelorator. If not, it stalls. I am lost. Help????

BlazerLT · #15 08-03-2005, 12:01 AM

Does the fuel pump hum when you try to restart it?

Ever replaced the fuel filter?

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