Quote:
Originally Posted by SilberUrS6
My 85 coupe has a very light hesitation between 1200 and 1800 at small partial throttle openings, and only in cool weather - it completely disappears once the ambient temp is above 60 Fahrenheit.
I guess I'm in for a vacuum leak chase-down at some point.
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Mine has exhibited that for years but even in warmer temps.
Quote:
Originally Posted by Mehoff
Just put my motor back in the car yesterday, had the same (relative) issue. Spent 3 hours diagnosing and checking everything........finally removed the intake and realized I missed a venting hose (literally had to stick my entire head into the back of the engine compartment to see it). Connected it and fired right up, perfect idle.
I would start there, it's a 10 minute check.
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You are very lucky!
Quote:
Originally Posted by skulp
My 84 did the same thing, I swapped the DME from an 85 Targa and it ran fine. Sent my DME out twice for repair unsuccessfully, then swapped it for another DME, it still surged. A third, NOS unit fixed the surge. My conclusion, a tested DME may still contain a fault. Hope this helps, I was tearing my hair out with my 84.
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That is an interesting point. Crazy you went through that and discovered that. In my mind, that is the only thing that can cause this oscillation of fuel delivery.
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Cory - turbo'd '87 C3.2 Guards/Blk, 3.4, 7.5:1 CR, 993SS cams, Borg-Warner S366 turbo @ 1.2-1.5 bar, Treadstone full bay IC, 70mm TB, TiAL F46 WG, HKS 1 1/2" BOV, twin 044 pumps, MicroSquirt AMP'd w/GM smart coilpack, Bilstein coilovers, Tramont replica Speedlines (285's rr, 225's frt), Big Reds frt, 993 rr., tower brace, MOMO wheel
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