When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
About the only test you can do is before you start it in the morning and it's cold, heat up the PCM with a hairdryer. Once warm start the engine, if it backfires right from the get go then the PCM is likely bad.
I think I found the culprit - I checked the fuel pressure. Idling it's 32psi, with vacuum taken off the regulator 39, but revving while on N pressure drops to 20psi, accelerating 10psi and then it backfires. Going slowly uphill pressure drops to 12-15 and backfires too.
Tomorrow I am going to drop the fuel tank and take out the fuel pump. I hope I find new one before the end of the week - fuel filter already pruchased
get new "decent" plug wires before ya try pcm---then if same problem go to junk yard and retreve a pcm--napa has good plug wires---plug wires were my my problem for 4 or 5 years
Usually the fuel filter is part of the fuel pump assembly. So unless you've defiantly seen one on your van, don't be surprised if you can't find one on there to replace.
Usually the fuel filter is part of the fuel pump assembly. So unless you've defiantly seen one on your van, don't be surprised if you can't find one on there to replace.
Thanks for the advice - I've found one - under the car, next to the frame, more or less under the side doors - kind of in-line filter.
Besides, now I know I have found the culprit - pictures below are the answer, why my b250 had problems with too low fuel pressure and backfired under load (hopefully it's a past tense
05-20-2017, 12:26 PM
