93 bonneville AGAIN!!!

hi everybody, I posted the other day on this car with no response...The plot thickens... My 93 bonneville se has several of us here totally bafffled...Just replaced the engine with a low mile used one..engine sounds great...Here's the problem. ..The car runs horrible for the first few minutes on a cold engine...it idles around 2000rpm and nearly dies when you try to accellerate..once running approx 2 minutes, it's drivable but has a hesitation from a dead start. Once your moving it runs pretty well. The check engine light is on intermittantly and was initially producing a different code every time I scanned it. Thinking at this point that I had a bad computer, I replaced the computer. Light's still on and off, problem's still there but now the only code info I'm getting is "fault in ESC circuit" and my scanner shows 0 deg timing advance...sometimes? New development I think may be related----Now the engine temp guage will not reach more than 150 deg f.---Replaced thermostat...again...no change, stll says it's not warming up fully, but I think it really is...{good heat, fans cycling properly} I'm beginning to suspect a bad ground problem somewhere as I have had a few other wiring problems crop up with the pwr windows and seats which required running a new grond wire to correct. Has anyone seen a problem like this and any suggestions where to look? thanks to all Gonz

Reply to
greatgonzos via CarKB.com
Loading thread data ...

Reply to
Shep

Grounds are very important. Double check those. Check what the engine temp sensor is showing. It's a primary input for fuel mixture, timing advance, etc.

Reply to
Mike Marlow

Like Mike advised above, check what the engine temp. sensor is showing AND conmpare it to a manual check using a suitable thermometer--CAREFUL TO NOT GET BURNED!!! I use a cooking therm. to check them with, but I have been removing radiator caps for y-e-a-r-s and know how to do so carefully. If you're not completely familiar with how to do so, pay a mechanic a couple of dollars to check it with wife's cooking therm--he should do it cheap. Reason for double-checking: these thermostats are tricky to install, & if not done properly, using outer o-ring, it'll merely float around in its housing & let water bypass it and run too cool. HTH, s

Reply to
sdlomi2

MotorsForum website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.