Very sick 94 Olds 88 Royale
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From: Purgatory
Should I consider completely dropping the entire exhaust system? Or just unbolt it from the manifold? My concern is that if I just unbolt it really won't open it up much because it will naturally try to find it'* way back to the "home" or at rest position.
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Originally Posted by vital49
There'* no hissing. I have a feeling if there was hissing that it would be a cough, hiss, cough, hiss, cough, hiss! 
You bring another very good point... The car runs hot. No doubt about it. It will easily run at 225 or so. I does have a 180 stat in it. It'* not low on coolant or have a weak pump either...they've both been recently changed. The fans kick on very quickly after the car'* started, too.
Also when idling the exhaust system shakes like made. Just vibrates back and forth...and it'* a good, vigorous vibration!!
If I pulled the O2 sensor do you think it would give clues if I have a restricted exhaust?
You bring another very good point... The car runs hot. No doubt about it. It will easily run at 225 or so. I does have a 180 stat in it. It'* not low on coolant or have a weak pump either...they've both been recently changed. The fans kick on very quickly after the car'* started, too.
Also when idling the exhaust system shakes like made. Just vibrates back and forth...and it'* a good, vigorous vibration!!
If I pulled the O2 sensor do you think it would give clues if I have a restricted exhaust?
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just use something to keep it lowered below the rest of your exhaust. I haven't tried it on my 'h' yet, but in the past when I've done this, the weight of the exhaust itself kept it from finding its 'home'. hard to say w/o doing it though...
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From: Purgatory
For the others following this thread...
Don sent me a replacement/test PCM out of another H-body. I swapped the EPROM from the existing PCM. Started it up and it continued to run poorly. Symptoms didn't change.
At this point, we're thinking the catalytic convertor is plugged.
Don sent me a replacement/test PCM out of another H-body. I swapped the EPROM from the existing PCM. Started it up and it continued to run poorly. Symptoms didn't change.
At this point, we're thinking the catalytic convertor is plugged.
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From: Purgatory
Originally Posted by theJMFC
Still haven't removed the two bolts to test that theory, eh? :?
I just ordered a new Magnaflow cat. Once it comes, I'll have the muffler shop install it.
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From: Purgatory
Originally Posted by daman
Hello Mark, have you checked your fuel pressure?? should be 35-45psi in thet range could be a cloged filter or pump going bad i've seen that before.
, you got a tough one ther, you'll just have to keep pluging away at it with the help from guys on here.
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From: Berkeley, IL
Originally Posted by jr's3800
Originally Posted by vital49
Originally Posted by mkaake
Good for you
Anyhew, at this point, I'd lean towards some sort of exaust restriction... you've got your compression, ignition, and fuel...
Anyhew, at this point, I'd lean towards some sort of exaust restriction... you've got your compression, ignition, and fuel...
when you were driving the car, did there exahust hiss like mad? I have seen times where the converter was plugged bad enough that it actually cause the engine to overheat...
I drove a Friends minivan, because he could not figure out what was wrong with it... I drove it around tha block and at 3000 Rpms it would hiss up a storm and have no power... I told him what it was and he fixed it.... Ran like H*** after that...