[00 SS]

My daily driver is an 88 Buick Park Ave. Lately, I've been having trouble with it running right when the engine is hot and I restart it. Almost seems to be vapor locking, but it's multiport fuel injection. Ocationally when this happens, I can bleed some "air" or maybe fuel vapor out of the schrader valve on the rail which sometimes helps, sometimes not. It starts, then idles like it's missing badly and the engine won't rev up. So far, I've been able to coax it into working and getting me where I need to go, but I at a bit of a loss as to why this is happening all of a sudden (the last week or so). The weather hasn't been too bad lately and it was certainly hotter earlier in the summer and it ran fine. It seems OK while I'm driving and after it's been allowed to cool down all the way.

The recent maintenance includes:
new fuel filter
new plugs
new coil packs and igniton contol module
Removed and cleaned injectors (really were pretty clean to begin with)

My ideas:
fuel pump is low on pressure allowing the fuel to vaporize in the rail while sitting after driving
Bad presure regulator not holding the pressure up while sitting after driving, or sticking not allowing the vapor to exit and return to the tank.

Any insight or ideads would be appreciated.

[00 SS]

I've got about 100 miles on it since the fuel pump install now. Seems to be running fine. Starts easily every time so far. The damn SES light is still on about 5% (or less) of the time. It seems to come on for a minute or two a few minutes after cold start and then it goes out. Then it sometimes comes back for a few seconds a few minutes later. Then it seems to stay off for the rest of the trip. It did this yesterday afternoon when I drove it and again this morning. There is no apparent performance difference light on or off.

The magnet does still exist. The connectors appear to be connected and tight. I haven't had the time to check continuity and resistance on each wire yet. But I'm thinking it must be in the wires at this point.

Is it possible that it's the crank piosition sensor instead? You mentioned the Cam sensor was wired through the crank sensor. I had to replace the harmonic balance sever months ago. The new new one went right on and seemed to line up well with the sensor, maybe it needs to be adjusted or replaced?

This post has been edited by 00 SS: Aug 22 2011, 02:02 PM