Hey, my acceleration is crap whats up?

TCMdocs944 · 10-06-2004, 03:59 PM

I just drove another 944 today and found out my acceleration is crap and has always been that way.

The car was an early 85 I am helping a friend check out. The thing is a 4/10 cosmetically and has recently had the head done.

It drives great and pulls strong throught the whole rpm range. Only difference that I could tell from mine is a throttle response cam......Maybe it has been chipped or something...dunno....

What is wrong with my car!?

It feels like I am dragging a trailer around compared to that car.

todd84944 · 10-06-2004, 04:06 PM

That car having a new head gasket, it could also have a re-worked head. It could not have been chipped without changing the air meter and putting a later dme in. Do a compression check on your car.

TCMdocs944 · 10-06-2004, 04:15 PM

Chip could have been soldered in....no dme change necessary.

AFM stays stock with early chips as far as I know.

Mine has new head work/gasket as well and drives just like it did before the belt went.

I shall go forth and check mine compression however.

bigyagi · bigyagi's Garage

when did you last change your fuel filter? that can be a source of poor accelleration, especially if its been in there for a while!
bob.

TCMdocs944 · 10-06-2004, 04:46 PM

Good call Big...never changed it and i don't know about the PO.

Has been at least 5 years I guess.

Has anyone noticed a big change by doing this?

livewirevoodoo · livewirevoodoo's Garage

Quote:

Originally posted by TCMdocs944
Good call Big...never changed it and i don't know about the PO.

Has been at least 5 years I guess.

Has anyone noticed a big change by doing this?

A change, yes.. nothing remarkable however. The accel was smoother and the idle was noticably better.

Macfreak007 · 10-06-2004, 07:13 PM

list your replacement dates for: Plugs, Wires, Distributor cap, rotor, cleaning the AFM, FPR, Injectors, does the car run totally smooth? the fuel filter made a rather large difference on my car personally, try that first!

TCMdocs944 · 10-07-2004, 12:14 PM

Wires - dont know

Cap and Rotor - new

AFM - suspect - opened it up to do the wiper fix and might have wiper fuxed it....tommorow I will tackle it

Injectors - 6 months ago new seals and tested

FPR - no surging

Vacuum - good

Idle - 950 nose on

Smooth - but not through the entire rpm range.

Feel - like it bogs a bit esp. cold.

Symptoms all disappear after an interstate drive of 2 hours....Get off the interstate and the damn thing thinks its a race car??

gearhead290 · 10-08-2004, 10:25 PM

I ported and polished my head along with a 3 angle valve job while it was off, didn't see a damn thing out of all that work.

Porsche-O-Phile · Porsche-O-Phile's Garage

Check for vaccum leaks carefully. You claim it's "good", but vaccum leaks can be very insidious. I had a hairline (and I do mean "hairline") crack in the Y connector to the fuel pressure regulator and dampener. The car ran like crap until I replaced it. BIG difference. I'd strongly recommend going to the all-silicone lines from Lindsey if you have the $35 to spend on it. Best $35 I ever spent.