Chris Watkinson
Member
Ok folks, I believe issue has been fixed by the shop. Sure enough, they replaced the fuel pump control module, and they had a misfire on #4 so swapped out the plug and coil there. Seems to be running pretty good now, and efficiency immediately went back up from about 9mpg to 12 or so.
For those not familiar with the fpcm, it's on top of a rear subframe support and they're notorious for corrosion. You can see it from outside looking in the driver rear wheel well. I took off the spare tire, stuck my head up in there, and look toward the side of the vehicle, just under where the gas cap would be. It's easy to access, and I prob could have taken it off myself and replaced it, but I just didn't have time/money to throw parts at the problem and I wasn't getting ANY fuel supply codes at all. Couldn't even verify if fuel pressure was abnormal.
Anyway I appreciate all the tips. I cleaned the MAF sensor just in case. I looked at Chilton/Haynes manual, but will look for a repair CD instead! And I don't know if I've EVER changed the fuel filter So I'll put that on the list for preventative fixes. I'm assuming my catalytic is still in need of replacing, but good to know its not the culprit this time.
Thanks again. Here's a pic of the FPCM still attached, from the inside view, indicating part number:
For those not familiar with the fpcm, it's on top of a rear subframe support and they're notorious for corrosion. You can see it from outside looking in the driver rear wheel well. I took off the spare tire, stuck my head up in there, and look toward the side of the vehicle, just under where the gas cap would be. It's easy to access, and I prob could have taken it off myself and replaced it, but I just didn't have time/money to throw parts at the problem and I wasn't getting ANY fuel supply codes at all. Couldn't even verify if fuel pressure was abnormal.
Anyway I appreciate all the tips. I cleaned the MAF sensor just in case. I looked at Chilton/Haynes manual, but will look for a repair CD instead! And I don't know if I've EVER changed the fuel filter So I'll put that on the list for preventative fixes. I'm assuming my catalytic is still in need of replacing, but good to know its not the culprit this time.
Thanks again. Here's a pic of the FPCM still attached, from the inside view, indicating part number: