Yes, another one of these threads. I did some searching but I'm not really sure if I am going in the right direction. I'm very new to this and certainly not a motor-head. I did order the 2 volume red tech books but wow are they overwhelming.

Anyway, my 95 is difficult to start when it is more than 15 minutes cold. If it is off when I run into the store quickly (under 15 minutes or so), it starts right up. However, longer than that and it takes anywhere from 5-10 seconds of cranking to catch. When it does catch, it seems to be very....lethargic until I give it some gas, then it is alright. You really have to listen carefully to hear when the engine has "caught". Sorry, I can't be more descriptive and use the correct terms.

My research told me to get a fuel pressure gauge as the first step, so I did yesterday. I hooked it up and turned the key. It went straight to 40 lbs with out any problem. Turning off the ignition, it stayed at 40 for several minutes before dropping a few pounds. Then slowly dropped to 22 or so after around 20 minutes. I can pull out a stop watch if that will help.

So, any ideas? Need some more information? I don't think it is the fuel pump, but could it be the fuel pressure regulator? I think there is also some sort of fuel sensor, could that be it.

Any ideas, I would be grateful. Thanks -

Jonas

 

Prime the pumps a couple of times before you start it for giggles. Any change if not its not fuel pressure.
Injectors? Best of luck.

 

What happens if it sits overnight?

 

I have tried turning on the ignition waiting for the fp to prime, then off and on again. It seems to help minimally if at all.

Thanks-

 

Same thing as 15 minutes or more, 5-10 seconds of good cranking.

 

Before moving to any complicated procedures, check some simple stuff first. The FPR could be the problem if it was leaking fuel back into the vacuum line. It could cause a rich condition and hard starting. Pull off the line and see if it is wet with fuel after you pressurize the system (KOKO).

When this condition occurs check for spark immediately. This would eliminate several major components if there is spark.

If no spark, I might then look at the ICM for a possible problem.

I think your pump and filter are not the cause of this problem.

I would not be thinking about the injectors at this time. 92-96 have pretty good injectors unlike the vetts of the late 80s that are known for problems.

 

Car runs fine after it starts so I'm not thinking injectors. Leaking injectors would give you a hot start problem.