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Old 01-14-2003, 12:01 PM
G-Benz's Avatar
G-Benz G-Benz is offline
Razorback Soccer Dad
Join Date: Apr 2001
Location: Dallas/Fort-Worth
Posts: 5,711
I am currently dealing with solving some of the similar issues, and will shed a bit of light on what NOT to look for.

O2 sensor.

Air flow meter. I replaced mine with no change in symptoms, and btw, it's more like $250, not $1100!

Possible problems: Vacuum leak. Check all vacuum hoses. Intake manifold leak. Both can cause the surging problems you describe.

Coolant Temp sensor. Also can cause problems. About $30.

OVP. Source of all sorts of evil witchcraft, but related to hot start problems and rough idle. OEM part was deemed defective long ago, and replacement is improved. $65

I would find another mechanic though...$1100 to replace a $250 part that YOU can install in 5 minutes!!!???

So what is an OVP? DO a search and if you have a few days to peruse all of the threads, you will know more than you want to about this little relay.
2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car
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