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Truck hesitating and starts and dies sometimes

R

Ratchetnator

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Banner Elk, NC
I have recently ran into an issue with my truck. Under moderate throttle it breaks up like its pulling air and not getting fuel. This is not constant but does this intermittently. Today I started it leaving from work and when I put it in gear it died. The truck wouldn't start for several minutes than it finally did and it was breaking up and sputtering. I kept it running with the throttle and it calmed down. I shut it down, went through and checked the fuel filter which had fuel in the housing, checked the grounds and all were tight. I would suspect the PMD but the truck does not stall once its been running for a minute or so and being hot or cold doesn't seem to make a difference. I was reading that this may be the oil pressure sensor? I put in a new lift pump thinking that it could be that because the truck had never had it replaced but no difference. The problem seems to be getting worse. Any suggestions?
 
Pretty much only three things to check.
1. Fuel delivery.
2. PMD.
3. grounds.

Seems like you have fuel delivery issue. Have you checked psi under load? I had a dirty tank sock cause very simular problem. Especialy if you have an aftermarket FSU I'd check on that too.
 
X2, Air is the system is the 1st thing to check for and includes PSI of the lift pump. Any air leaks and fuel drains back to the tank. This includes pinholes in the fuel heater, sticking injectors, bad o-rings, bad hoses, rusted fuel pickup assy etc.
 
No.

But you can first try to blow compressed air to knock any crud off of it (temp fix). Disconect LP, remove fuel cap and blow air back to tank/sock.
 
Ratchetnator said:
I have recently ran into an issue with my truck. Under moderate throttle it breaks up like its pulling air and not getting fuel. This is not constant but does this intermittently. Today I started it leaving from work and when I put it in gear it died. The truck wouldn't start for several minutes than it finally did and it was breaking up and sputtering. I kept it running with the throttle and it calmed down. I shut it down, went through and checked the fuel filter which had fuel in the housing, checked the grounds and all were tight. I would suspect the PMD but the truck does not stall once its been running for a minute or so and being hot or cold doesn't seem to make a difference. I was reading that this may be the oil pressure sensor? I put in a new lift pump thinking that it could be that because the truck had never had it replaced but no difference. The problem seems to be getting worse. Any suggestions?
Click to expand...

When I had a similar issue, mine would start when I vented the fuel cap. I checked voltage at the lift pump and determined the OPS was bad by intermittent voltage.

Lift pump relay mod is a good idea, incidentally. I've got all the photos to do a write up, as soon as I figure out how to reduce photo size again.
 
Pull the trouble codes from the pcm and see what's in the history. If there are history codes make sure you pull the freeze frame data before clearing the codes or it will all be lost...
 
Forgot the relay thing is only for '94-95 model years.

great white, (off topic) do you still have the photos you took when you did your mirror upgrade? They don't show up in the thread anymore. I can't send you a PM, or I'd do that instead of hijacking.
 
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