'87 944 N/A Surging Issues

[PorscheChef]

I have an '87 N/A which was pretty much rebuilt. Now as I am driving, it surges a little bit and seems to be a little under powered. I checked all of the vacuum lines and they are correct. Any other ideas?

[Ater]

Check the timming My924 would do the same thing and it hated intown driving till i played with the timing.

[John_AZ]

Get some engine information with a compression and leak down test
Compression-leakdown test
Remove the DME relay when you do a compression test!

This will tell you the condition of the engine.

Clean electrical connections and grounds-Porsche WSM first step.

The surging is usually a vacuum leak.

Even though you checked the vacuum lines, the leak will most likely be in the hoses to the ICV and intake hose connections under the intake manifold or the J-Boot air intake.

There are a lot of WYAIT-While You Are In There- items to do when you take the intake off.

Start with removing the J-Boot air intake.
Check all the hoses for cracks and get new non perforated hose clamps or the OEM clamps- Oetiker Stepless Ear clamps.

The throttle body should be rebuilt.
Throttle Body Reseal kits for Porsche

Check the AFM thoroughly:
Air Flow Meter (AFM) Operation and Testing

If these repairs do not solve the "little" surging/ "little power issue do the complete under intake maintenance.

Get the injectors cleaned, resealed and matched-- WitchHunter Performance - Injector Cleaning & Flow Testing Services
Clean the ICV
Replace the AOS seals
Replace hoses to the ICV and clamps
Get the oil dipstick "O" ring $3

Then check the AFM for proper working condition.
Air Flow Meter (AFM) Operation and Testing

Were you expecting a magic chant?

GL
John

[PorscheChef]

WOW! Great information! Thank you for your time!

[Gawernator]

John is "the man"

[PorscheChef]

Cleaning the Air Flow Meter did the trick. Thanks again!

[mytrplseven]

You got out cheap. Good on ya.