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740 turbo hesitation stumble loss of power

My roomate had a 86 740 turbo he got so fed up with i talked him into taking my crx for a it in a trade :> however im still left with this problem. the car starts up fine and idles, once it warms up a little it starts to idle a little rough if i put it in drive hold the brake and give it gas the rpms climb then fall back but the tach does not fall to 0 tho, then it picks up and drops picks up and drops the problem has goten worse and worse over time and now the car is not diveable other then idling it around the yard he has replaced the following: maf, wires cap & rotor, wiring harness (it was frightning)the ignition controll module and the fuel controll module both fuel pumps and the fuel pump relay, fpr, and the entire intake manifold incl tps fuel injectors and throttle body (he worked at a volvo repair place so it wont a big deal gettin the parts) all of the turbo and vacume hoses have been checked and replaced as needed the engine and turbo have under 100K on them and are in great shape so any suggestions folks ? Thanks !








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740 turbo hesitation stumble loss of power

Its not just with the brake its any time i put the engine under load weither im powerbrakeing it or simply trying to drive the car. thanks!








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740 turbo hesitation stumble loss of power

Does the crazy idle only happen when you've got your foot on the brake pedal? If so, could be the vacuum check valve on the brake booster. There have been a couple threads on this very problem in the past 3 or 4 days:

Irrratic Idle When Applying Brakes

Brake booster check valve replacement?

I just ordered the check valve today... $8.50 from fcp groton.

- Brian







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