1994 BMW 325 surge problem

[Jimw]

My 1994 325 has an internittent speed surge problem. At ~48-50 MPH, the RPMS/speed will surge up and down over about a 5MPH range.
Would appreciate any starting points to start looking for problem.


Any help is appreciated.

Thanks,

Jimw

[marti5]

Give the throttle body a clean and your maf, your maf may also have failed

[Jimw]

Thanks! Will check for proper MAF voltage and also clean. Also, do you advocate taking to throttle body off to clean or is there something that be sprayed into the intake (or gas tank) while engine running?

Thanks,
Jim

[johnnyBgood]

Originally Posted by Jimw

Thanks! Will check for proper MAF voltage and also clean. Also, do you advocate taking to throttle body off to clean or is there something that be sprayed into the intake (or gas tank) while engine running?

Thanks,
Jim

e36-tech.com | CLEANING YOUR Mass Air Flow Sensor DIY

or they do sell MAF cleaner in a spray can......

[Jimw]

If it is not the MAF, should you clean the Throttle Body? Can you clean this without removing the Throttle Body by spraying something (carb cleaner) into the intake?

Appreciate your input.

Jim

[johnnyBgood]

Originally Posted by Jimw

If it is not the MAF, should you clean the Throttle Body? Can you clean this without removing the Throttle Body by spraying something (carb cleaner) into the intake?

Appreciate your input.

Jim

Yes you can......also check the intake boot for dry rotting & cracks...

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