1987 924S Idle Stutter and AFM Unplugged

The car stutters and almost falls flat on its face whenever I start it when it's cold. It only happens when I lightly touch the throttle. It's less obvious if I rev it a little more, but it's still there. When the car is warmed up, it's not as bad, but the problem still exists.

If I unplug the AFM, the cars idle stays the same unless I touch the throttle again, then the car just about dies. When the car is completely warmed up, and I unplug it, the car dies.

I was unable to unplug the DME temp sensor, but I will attempt that another day and see what happens.

I did not want to rev the car hard since it was not warmed up all the way.

Category:

Autos & Vehicles

Tags:

• automatic
• 944
• 924S
• porsche
• 1987
• late
• model
• guards
• red
• idle
• problem
• issue
• tachometer
• air
• flow
• meter
• afm
• mass
• maf
• dme

[Coolbri1191]

@EzTheHusky I'm cleaning out the throttle body today. my fuel system is operating perfectly. new fuel pump, fuel filter, fpr fpd and fuel rail working adequately, but only injectors 1 and 2 are rebuilt. (needed to save money since 3 and 4 were 'okay').

Also I got part of the J-boot off last night to see the throttle body and inside the boot, and there was a little oil in there!! Which means only one thing: AOS seals are blown :( such a pita to get to

[EzTheHusky]

I too had a similar problem!

Have you checked your fuel system? like new/rebuilt injectors, new regulators and dampers, so on?

My staggering idle problem was fixed almost immediatly when I replaced all that stuff and I do recall you saying there is a vac leak in the vid, which will make the RPMs stagger too (from expereience).

God I wish I were there to help, I just had a similar problem like this, ugh I feel powerless with helping lol!