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| No power past 3500 rpms (Page 1/2) |
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Madathlon
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APR 23, 04:19 PM
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I have searched and can not find anything that's fits the issue fully. So I have a 87 v6 2.8 gt. New alt. New distributor. (Other issue) starts and idles just fine. Drives fine until I get to 3500 rpms. Then simply no guts. Will still do 70mph with no problem. Just hit a wall at 3500. All ideas welcomed
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olejoedad
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APR 23, 04:21 PM
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First place I'd check would be timing, followed by the coil.
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Gall757
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APR 23, 04:39 PM
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The next check might be CAT blockage.
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Madathlon
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APR 23, 05:33 PM
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Free revs nicely. And sounds good so don't think it's a cat. But can a Ignition Module (IM) fail and it keep running. from what I remember the IM handle Timing to a set point then the ECM takes over. Could this IM not be passing control over.
Check dist to see if it moved and its still locked down solid. I know that not checking the timing but I did the timing two weeks ago and it was good then and it can move..
And its not throwing a service engine light at all. (Light does work, Disconnected Throttle position sensor and it came right on.)
Its runs so nicely otherwise and free revs like nothings wrong.
(Just bugging the H out of me)[This message has been edited by Madathlon (edited 04-23-2019).]
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Crasian
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APR 23, 08:26 PM
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Can’t rule out the CAT just because it free revs well.. seen many a cars that has plugged converters and have similar problems. I would “gap” the exhaust just before the CAT and go for a test drive. It’s free to try and fairly simple to do.
-Crasian
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Spoon
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APR 23, 10:41 PM
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Buy yourself an automotive vacuum gauge and google how to use it to check for bad cat. Make sure engine and exhaust is warmed up 1st.
Less than 15 bucks on Amazon.
Spoon
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"Kilgore Trout once wrote a short story which was a dialogue between two pieces of yeast. They were discussing the possible purposes of life as they ate sugar and suffocated in their own excrement. Because of their limited intelligence, they never came close to guessing that they were making champagne." - Kurt Vonnegut
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Madathlon
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APR 24, 08:51 AM
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Checked timing, it's just perfect. So thinking I slagged the cat. Is there only one o2 sensor?
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Gall757
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APR 24, 08:55 AM
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Madathlon
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APR 24, 09:25 AM
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So I can do a test bypass with no worry of the o2 throwing a fit.
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Gall757
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APR 24, 10:31 AM
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The usual test is to pull the O2 sensor and see if the car runs better.
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