924Board.org

[Glemon]

The round thing in the air intake snorkel that goes up and down by the fuel injection distributor, not the one mechanically connected to the gas pedal. Anyway the car started running very rough after I had idled for a couple minutes waiting for a train to pass. Low on power, obvious miss. Went away the next time I started it, but came back after it warmed up.

Because it was easy and I remember reading you could get a rough idle if it was oily I pulled the snorkel and took a look. It appeared to be centered and moving as it should, a little greasy/oily but no big drops or runs of oil on it.

But since I was in there I took some spray can brake cleaner and wiped it down well. The car now seems to be running like a champ without even the slight, occasional miss or stumble that I had before the above described problem started.

Could it be that easy?
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88 924S
68 TR250
02 IS300

[Fifty50Plus]

Sometimes yes. Congrats.
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1979 924 NA race car H-Prod SCCA
1982 924 NA race car - Sold
1981 924 Turbo sold
1982 924 Turbo sold
1972 911 E race car - traded for Cayenne Diesel
1975 914 1.8 Building for H-Prod SCCA

[Paul]

Or maybe you fixed a vacuum leak...
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White 87 924S "Ghost"
Silver 98 986 3.6l 320 HP "Frank N Stein"
White 01 986 "Christine"
Polar Silver 02 996TT. "Turbo"
Owned and repaired 924s since 1977
Porsche: It's not driving, it's therapy.

[Glemon]

I had plenty of vacuum leaks when I got the car, it still ran better then than with the miss the recently developed. I am not real sure of how well the ignition and injection are working, but I am pretty sure I have the vacuum leak thing addressed. I have replaced most of the plumbing with new hose, tightened a lot of clamps, and even hooked a few disconnected lines back up.

My question, maybe not clearly stated, was for those with more experience with the cars than I, was how badly will an oilyou air flow sensor plate make the car run. It was more than a little stumble, more like hardly enough power to accelerate and worrying about whether I would get home.

I suspect it is an intermittent issue with the injection or ignition and it will return. Buy maybe I am a pessimist.

I ordered new plug wires because a couple seemed to have stretched a little at the connection to the silver plug cover when I tried to pull them. I have replaced the o2 sensor and cleaned up all engine grounds, but should probably go through the CIS diagnostics procedure I have read about here on the forum.

I am sure the car has sat for periods of time in its life, and one thought is sediment or blockage somewhere in the fuel system. I have had that cause intermittent problems like this on other old cars. Fuel pressure pushes crap in the system to a point in the system where it builds up, eventually slowing or even stopping the flow of fuel, cars sits, pressure behind the clog releases and all is fine again for a short while. Then again I have had electrical faults exhibit the same behavior. But most of my experience is with pre-emissions era cars that have a lot fewer potential fail points.
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88 924S
68 TR250
02 IS300

[Fasteddie313]

[Glemon]

Thank you, I didn't take the plate off when I sprayed it, but I am sure some brake cleaner ran down into the mechanism
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88 924S
68 TR250
02 IS300

[Fasteddie313]

If you separate the 2 halves of the air metering housing, by taking all the bolts out around its outside, you can really get in there and clean it good..

If I was to clean it with brake clean I would probably spray it with WD40 afterwards to prevent rust..
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80 Turbo - Slightly Modified

[Glemon]

Thanks, sounds like a good job for next weekend.
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88 924S
68 TR250
02 IS300