[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.

[StanIROCZ]

I don't remember the symptoms but FWIW I had to replaced the cam sensor in my '90 LeSabre. I followed a the trouble shooting guide from a service manual that positively ID'd the cam sensor. I replaced both parts ofthe sensor and timing chain while I was in there. Had 285k on that car before it was stolen.

[trackbird]

I don't remember the symptoms but FWIW I had to replaced the cam sensor in my '90 LeSabre. I followed a the trouble shooting guide from a service manual that positively ID'd the cam sensor. I replaced both parts ofthe sensor and timing chain while I was in there. Had 285k on that car before it was stolen.

Somebody stole a '90 LeSabre? In Detroit?

(IMG:http://www.frrax.com/rrforum/style_emoticons/default/2thumbs.gif)

[StanIROCZ]

Somebody stole a '90 LeSabre? In Detroit?

(IMG:http://www.frrax.com/rrforum/style_emoticons/default/2thumbs.gif)

haha I can't explain that one, other than this is Detroit and the car was in great condition.

[00 SS]

Well, I think it may be fixed. I ran out of ideas on how to diagnose it, so I started throwing parts at it. I replaced the cam position sensor first since that's what the code was. I did this Sunday and the light either burned out, or the code is has not returned. Knocking on wood and keeping my fingers crossed.