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| Vetron87 | Flat spot when accelerating. | ||
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Elite Guru
 
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Guys need your input. Took the 87 out this morning before the rain. When accelerating from a stop light the engine reaches a flat spot when upshifting around 30-40. This situation is erradic once I push down on the gas it kicks down and accelerates fine. WTF no codes, total tune up last summer, seems like its straving for fuel, new pump, fuel filter has 3,000 miles on it. Engines never dies, Acts like the old big block chevys with a Quad Jet when the accelerator pump was going bad. Any thoughts!
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Posted on: 2011/7/3 1:38
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Bone stock 87 conv. |
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| Matatk | Re: Flat spot when accelerating. | ||
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Webmaster
 
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A few things come to mind, Ron. It could be fuel related but I doubt it if it only happens at one specific point. I'd lean towards electrical or ignition. I found a flat spot in my acceleration was caused by a bad maf that was intermittent. Also check plugs/wires/cap. A good datalog can help you narrow it down by comparing values. Also, for s&g make sure your tv cable is adjusted right.
Matthew |
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Posted on: 2011/7/3 3:02
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2002 EBM convertible, Magnusson supercharger, cam, headers, etc. 1989 Corvette...RIP |
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| bogus | Re: Flat spot when accelerating. | ||
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Grand Imperial Pooh-Bah
 
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Sounds like you need to adjust the TV Cable.
The attached JPG should give you an idea! Basically, you push the D-shaped tang down, pull the cable out, then floor the throttle. It self sets, sorta. Just don't do this with the engine running!  Attach file:  TV Cable.jpg (149.81 KB) |
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Posted on: 2011/7/3 3:08
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The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw Education is the best tool to overcome irrational fear. - me |
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| joeld | Re: Flat spot when accelerating. | ||
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Guru
 
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When you described the problem as feeling like "a bad accelerator pump", I remembered my 89 did this years ago. My problem was the TPS had a dead/weak spot in it also around 30-40 mph. I don't remember the RPM range now, been too long ago. Can you scan the voltage from the no throttle position thru a smooth opening of throttle? Should raise steady from approx. .54 volts to approx 4.8/5.0 volts.
Joel |
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Posted on: 2011/7/3 3:54
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1989 Coupe,L98 automatic |
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| Vetron87 | Re: Flat spot when accelerating. | ||
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Elite Guru
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Thanks guys it was the tv cable. The 87 is getting bitchie the older it gets.
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Posted on: 2011/7/4 0:54
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Bone stock 87 conv. |
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| bogus | Re: Flat spot when accelerating. | ||
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Grand Imperial Pooh-Bah
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Glad it was simple! The cable stretches over time and falls out of adjustment.
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Posted on: 2011/7/4 4:02
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The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw Education is the best tool to overcome irrational fear. - me |
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| Matatk | Re: Flat spot when accelerating. | ||
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Webmaster
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The best fix is a free and easy one!
Matthew |
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Posted on: 2011/7/4 11:32
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2002 EBM convertible, Magnusson supercharger, cam, headers, etc. 1989 Corvette...RIP |
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| Calm | Re: Flat spot when accelerating. | ||
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Senior Guru
 
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Quote:
Don't we all? |
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Posted on: 2011/7/4 17:52
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1995 Forged 385 ZF6 227/234 1.6 FIC30# MSD BBK SS SLP Bullets X-Pipe DynoMax |
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| bogus | Re: Flat spot when accelerating. | ||
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Grand Imperial Pooh-Bah
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Quote:
Does that mean I will need to change your handle to something like "cranky"? |
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Posted on: 2011/7/4 19:43
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The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw Education is the best tool to overcome irrational fear. - me |
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| Calm | Re: Flat spot when accelerating. | ||
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Senior Guru
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Quote:
I'm going for calmly cranky.  |
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Posted on: 2011/7/4 20:54
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1995 Forged 385 ZF6 227/234 1.6 FIC30# MSD BBK SS SLP Bullets X-Pipe DynoMax |
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