Help with annoying 964 hesitation

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Help with annoying 964 hesitation

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Porsche >> Porsche Models >> Porsche 911 >> Help with annoying 964 hesitation

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Help with annoying 964 hesitation - 7/20/2008 9:59:44 PM

Erlkonig

Posts: 4
Joined: 7/11/2008
Status: offline

My 964 C4 has a hesitation when I depress the throttle hard. The engine will hesitate or bog for a full second or two then start to accelerate. It also happens when cruising in gears 2-4. I also notice an intermittent rough idle. I have new plugs, wires, caps, and rotors. The primary distributor belt was replaced last winter. DME relay and fuel filter on order. What else could be causing this?

Post #: 1

RE: Help with annoying 964 hesitation - 7/21/2008 6:35:49 AM

PorscheDoc

Posts: 2558
Joined: 4/24/2005
From: Overland Park, KS
Status: offline

Might want to pull the AFM and check to make sure the potentiometer arm is not riding in a groove on the strip.

_____________________________

Doc Wilen
I Stayed At A Holiday Inn Express Last Night
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86 951: 295WHP/275RWTQ. 2670lbs

(in reply to Erlkonig)

Post #: 2

RE: Help with annoying 964 hesitation - 7/21/2008 10:18:03 PM

Erlkonig

Posts: 4
Joined: 7/11/2008
Status: offline

If the Air Flow Meter is the culprit can the AFM be repaired or do I have to spend $1279.00 for a new one? I noticed that my old plugs were white. Is this a good indication of the AFM making her run lean and causing the hesitations?

(in reply to PorscheDoc)

Post #: 3

RE: Help with annoying 964 hesitation - 7/22/2008 8:03:21 PM

Erlkonig

Posts: 4
Joined: 7/11/2008
Status: offline

There is a really good video on youtube called "Rejuvenating a Bosch Motronic AFM". I''m pulling mine ASAP to fix it. Is there anything else I should be looking at?

(in reply to Erlkonig)

Post #: 4

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