1987 TurboII lagging @ 4000 RPM
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From: houston
1987 TurboII lagging @ 4000 RPM
Car runs extremely well untill it hits 4000 RPm then it lags and bogs down. Up shift to next gear and no problem until u hit 4K rpm again. I have changed the turbo boost sensor, resistor pak under air filter box. Is my next move to change the secondary injectors or could it be the ecu. any help appreciated.
From the FAQ's
"I have this hesitation whenever I accelerate right around 3500-4000 RPM
The dreaded 3800 RPM hesitation is cause 90% of the time by poor ground connections between the engine, the battery, and the car. Clean or replace all the under hood ground connections. On 86 model year cars , replacing/regrounding the pressure sensor's ground wire has helped (do not re-ground a 87 or later model year). If there is still a problem after that, look at cleaning the fuel injectors and (on a N/A) that your 5th/6th ports are operating correctly."
It could also possibly be clogged cats if you still have them.
"I have this hesitation whenever I accelerate right around 3500-4000 RPM
The dreaded 3800 RPM hesitation is cause 90% of the time by poor ground connections between the engine, the battery, and the car. Clean or replace all the under hood ground connections. On 86 model year cars , replacing/regrounding the pressure sensor's ground wire has helped (do not re-ground a 87 or later model year). If there is still a problem after that, look at cleaning the fuel injectors and (on a N/A) that your 5th/6th ports are operating correctly."
It could also possibly be clogged cats if you still have them.
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barkz
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Nov 21, 2020 09:34 AM