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almostordinary almostordinary is offline
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Join Date: Apr 2022
Location: Los Angeles
Posts: 833
Garage
Idle / Lean running - 87 Head Scratcher

Hey gang,

Thought I finally found my lean horrible low RPM issue and took the car out and it's still stumbling all of this happened after a very wet wash (especially water in the engine bay):



Laundry List:
- Clean IAC
- Clean AFM (Didnt open the internals this time)
- Smoke Test (No leaks)
- New Plugs
- Replaced #6 wire as it had green corrosion (likely from water sitting as the plug sits upward)
- New Cap
- New Rotor
- New Fuel Pump
- New Fuel Filter
- Additional Ground to block
- New O2 Wideband
- New Alternator Pulley
- New Alternator Belt
- Replaced Focus 9 DME with Stock new Porsche DME
- New Cylinder Head Temp Sensor

When I start the motor everything sounds great, AFRs are around 13.8 - 14.2

Once load is put on the car is begins to buck a bit, then at a stop idle is all over the place and the motor leans out.

When I get on it, up to and before ~4000RPM it runs like crap, then at 4k it pulls like normal.

Wondering if it may be time to look at a new AFM? I did the sweeper clean a while back.
Anyone have a spare 3.2 AFM sitting on a shelf I can try out?

Looking for Cooler heads prevail. picked a hell of a time to do a dry June/July... I need a drink.

Any help appreciated.

Thanks,
Ian
Old 06-07-2025, 03:22 PM
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