Question about Cars & Trucks
At highway speeds the turbo will on occasion will surge up and down. Not a constant problem but annoying.
Do you know if this is an electronically controlled turbo or air controlled?
Posted on Jul 18, 2013
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Posted on Jan 02, 2017
those sensors could cause the issue, clean the MAF 1st, also clean the idle system using the following procedure, the IAC can cause cruise surge. I use this to cure these problems all the time.
Here is the most common cause of surges and stalls and low idle, it is the idle speed control air-bypass valve (IAC) and throttle valve, they get full of gunk over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.
Posted on Jan 13, 2009
Is the check engine light on?
A major cause of surging is either air leaks between the air flow meter and the engine intake manifold, or a bad or mis-adjusted throttle position sensor.
Posted on Feb 25, 2009
Sounds like the throttle position sensor to me. I have a 1991 caprice wagon and I have to replace this part every 6 months or so. It's a cheap easy to replace part, around $25, but I haven't been able to find one that will last like the OEM. It's just a variable resistor that tells the computer where you have the gas pedel. When it fails it tells the computer you're giving it gas when you're not.
Posted on Jul 12, 2009
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