Fuel pump is over heating. Replace the pump with a new one A/C Delco part only others have been known not to hold pressure. I know I have lived that nightmare. Again A/C Delco part only. Good luck.
Thanx flarustler I had installed new ac pump just before your answer.it fixed it again thanx for your input
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SOURCE: Idleing Problems Need help
I had the same problem when I first got my firebird. All I did to mine was change the Spark plugs and wires, and had a mechanic friend of mine check and set the timing. since then I haven"t and problem with the idleing on my car. Personally I would also change out the cap and rotor, and see if that helps.
SOURCE: 91 Chevy 1500 stalls
Hi Michelle;
I know this is frustrating but I do not want you to throw money at your truck when it is not necessary. The 91 is an OBD1 system. Have you downloaded the codes? I can be of more assistance if I have the codes to diagnois. You definetly have a problem, I wan to solve it.
Since you just had a new engine installed and then the problem started, I would look very closely at the fuel lines. Perhaps the engine torque is pinching a flex line. Perhaps when you engage reverse, something is hitting and grounding out. It seems to me when you engage reverse the torque rolls the engine to far and maybe grounds out the coil. Are your motor mounts in good shape? Check by opening the hood, put your foot on the brake hard, engage reverse, and keeping your foot hard on the brake, give it gas. If the engine rolls up off the mount the mount is broken. You may need to have someone help you with this.
Let's keep talking. I really want to help.
Thanks;
Rich
RPM Northwest
SOURCE: oil pressure high when engine cold. but fine when engine is warm
It is normal for oil pressure to be higher when the oil is cold. As the oil heats up, it will thin out. Since your oil pump is driven faster with the acceleration of the engine, your pressure will also increase. On a engine up to full temp, your oil pressure will probably be around 20 psi and maybe up to 60 at full load. But on a cold engine, you may see 60 psi at idle. I dont know if your high oil pressure is causing your vehicle to stall, but maybe your running the wrong weight/type of oil for your truck. If you live in a extreme cold area, you may want to look into a block heater to help warm up your engine faster.
SOURCE: 3.4L engine stall at stops
do u have a check engine light coming on? if not the plugs are not the problem a miss will trigger a check engine/service engine soon light, most likely you have a dirty automatic idle speed control motor.
SOURCE: from cold start engine warms to quater temp then
Does the Check Engine light come ON when this happens? Whenever the "Check Engine" light comes on, there is always a DTC (Diagnostic Trouble Code) stored in the ECM (Engine Control Module). You'll need an OBDII (On-Board-Diagnostics) scanner to retrieve any codes recorded/set in ECM. Otherwise, guesswork. I have MANY ideas that could send you on a wild goose chase. I strongly suspect EMS (Engine Management System) sensor beginning to malfunction as it warms up. First strong suspicion is the crank position sensor (CKP) - however,usually always sets a DTC (i.e., P0335, P0336). The next suspicion is the Engine Coolant Temperature sensor. The ECM uses this sensor's signal to adjust fuel, timing, engine RPM, etc based on engine temp. If malfunctioning at a particuar point during engine warm up, it could be telling the ECM the temperature is LOWER or HIGHER than it ACTUALLY is, resulting in the ECM to increase fuel (flood it) or give it LESS fuel (starve it). If this malfunction lasts long enough, the ECM will usually set a DTC for that sensor circuit, either a Range/Performance code, or a "LOW Input" or "HIGH Input" code.
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