Very sick 94 Olds 88 Royale - Page 4 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 08-24-2005, 04:24 PM   #31
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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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Old 08-24-2005, 04:24 PM   #32
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Quote:
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?
If the cat was bad it would be like $57 shipped for a 2.5" high flow...

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Old 08-24-2005, 04:25 PM   #33
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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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Old 08-29-2005, 11:04 AM   #34
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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.
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Old 08-29-2005, 04:08 PM   #35
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Still haven't removed the two bolts to test that theory, eh?
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Old 08-29-2005, 04:11 PM   #36
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Quote:
Originally Posted by theJMFC
Still haven't removed the two bolts to test that theory, eh?
No, never did. LOL.

I just ordered a new Magnaflow cat. Once it comes, I'll have the muffler shop install it.
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Old 08-29-2005, 06:12 PM   #37
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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.
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Old 08-29-2005, 08:37 PM   #38
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Quote:
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.
Yes, I've checked the fuel pressure. I'm getting 41-42 lbs. of pressure. I also changed the fuel filter when I did the tune up a couple weeks ago. The pump was replaced ~15,000 miles ago.
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Old 08-29-2005, 10:45 PM   #39
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Boy if you got no codes and you did all that to it , 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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Old 08-30-2005, 04:54 AM   #40
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Quote:
Originally Posted by jr's3800
Quote:
Originally Posted by vital49
Quote:
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...
Would the catalytic convertor always rattle when it'* bad? Currently, the one on the car doesn't rattle.
Nope, sometimes they just get clogged... I have seen a few do that... I have seen a few rattle as well.... Sometimes they do sometimes they don't...

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...
why would the exhaust hiss if it were clogged?
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