1990 928 GT with chronic 4 cylinder mode issue

I would happily pay the $928 if someone found it, as it seems I have already paid many times that for it *not* to be found.

But it still hasn't been found....

I did know your payment comment was a joke though.

I checked the coil wire connections on the driver side. They seem fine, as expected since I replaced the coil before the car went in for service.

Trying to find the ground mentioned in the above comments, so spent @15 minutes trying to access the MAS/MAF band clip head. No joy there yet.

My 53 year old back will feel like it is 83 by the time I get through this and will impede ever step of this process, so bear with me, it will be slow and get slower. I have been down this road before, thus why I was willing to pay a service shop to do work I can do.....

SeanR;5938 wrote: Yes, sounds like bad ground, intermittent ground and I think I know which one it is.

Pull the air box and MAF. Right side in the V, under the throttle cable pulley is a block ground that is the grounding point for the EZK/LH. There is also the ground for the MAF and a CPS on the left side, in the V. Check those and ensure they are grounded.

I found a ground on the driver side at the back edge of the block, not in the V itself, this was just to (driver) side of the throttle cable pulley. it was tight and when removed was shiny, so was apparently checked and cleaned at some recent point.

I would like to review the other ground as well, if I can find it, but I haven't seen it yet.

Perhaps noteworthy, but I will reserve optimism, is the MAF boot is cracked and I can see the wires have broken coating, thus there is a chance they could be arcing to each other. (photo below) What is the suggested repair? Just wrap them with electric tape? Shrink wrapping them might be feasible if there is shrink that can be wrapped, so I don't have to splice the wires. Or I could get another boot and splice it in. Thoughts?

P.S. laying on the motor worked well, and my back appreciated the position lmao

Attached files [img]media/attachments/5964=668-maf_wires_small.jpg[/img]

Stan......you found one of two grounds, the other is real close to the first

If it were my car I'd find a harness that has a good MAF connector and wiring and do the splicing far away from the connector. I know who has one

malcolm;5969 wrote: Stan......you found one of two grounds, the other is real close to the first

If it were my car I'd find a harness that has a good MAF connector and wiring and do the splicing far away from the connector. I know who has one

I think the MAF is the same connector since '85, do you know? I may have an '85 harness in the shed. Otherwise I will see who has one.

I cut my harness at the firewall and both ends are hanging up.

I have robbed some connectors off of it and will have to see if the MAF connector is any good.

I don't know if Malcolm was suggesting me or if he has one.

Brad

Didnt know what you did Brad and wouldn't presume anyway.

Stan, I do have a harness off a '87.....let me know.