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So I have a 91 Explorer that just failed smog because it was running rich. about 7 years ago I had the same problem, I changed out several sensors on the truck, and the 1 that finally passed it was the O2 sensor. This time around I ran my scanner on it, KEY ON ENGINE OFF I got a code 14 the...

I have a problem with the right flasher. it works fine with the headlights off but when I turn the headlights on the flasher sticks on with the head lights. the bulbs are all good, changed them just to be sure and they all work individually. I think I have narrowed it down to a short in a ground...

I just checked the lights and bubs, there working. how would I go about checking for a short?

thx for all the suggestions. I actually noticed the right headlight was not fully lit up. the main bulb is working fine, pulled it out and checked it, the top portion where the signal is behind the orange glass isn't lit up. im hoping its just a bad bulb. but shouldn't I have the problem with...

I have tried pulling codes and all codes passed, I pulled fuses and nothing helped. during the day both flashers work fine nothing wrong. but the problem is when I turn the head lights on, the right flasher on the inside of the car is permanently on(solid not flashing). the left flasher works as...

it runs great except for the popping, no more stalling, no more jerking at acceleration, its smooth, not running rich now, i got code 11 for koeo and 11 for koer, did the compression test, all in range, i didnt lose pressure on any cylinders.

so i replaced the fuel pressure regulator today, it defiitely helped some other problems, the engine doesnt chug when i let off the gas and it doesnt wanna die, its smooth when i stop and theres no hesitation or jerking when i hit the gas, and when i scanned it i got an 11 koeo and 11 in koer so...

my truck idles fine in park but backfires when i shift into drive, theres a large hole in the muffler, if i replace the muffler will the backfire stop? does a large hole in the muffler create a popping or backfire sound?

that was a great help thank you, im about to replace the fuel filter and i have a fpr being shipped in.

i have read a few articles about the fuel pressure regulator contributing to running rich. could this maybe be my last part to change out before im good to go? before i changed all my senors i experienced jerking during acceleration, and stalling while at a light or stop sign. i no longer have...

code 42-exhaust gas oxygen(ego) sensor: voltage signal always "rich"(high value)-does not switch. so i have nearly fixed my 91 explorer, all thats left is a code 42. i replaced nearly all my sensors(including a brand new 02 sensor), did a compression test on the engine, and my obd1 scanner...

my 1991 explorer has been backfiring, so on the advice and the good people on here i did a compession test, the results are as follows c1=130 c2=130 c3=145 c4=150 c5=140 c6=140 20psi difference between high and low and i didnt see the needle lose pressure so i dont think i have a leak, is...

if the valve is stuck open, how do i fix it? i noticed it only back fires in drive, idling in park it does not.

brand new map sensor, reset the continuous codes. i stopped getting a 22 with the koeo, but still getting a 22 koer. ya i compared my sparkplugs to the old ones, same exact ones, i gapped them all at .54. one of my customers at work suggested a compression test so ill check that out next. could...

11 koeo, 22 koer, ran a smoke test, no leaks. i didn't touch the timing but i think it may be off. i know the first and loudest backfire blew the muffler. what I'm trying to figure out is all these smaller backfires. when i changed the spark plugs i mixed up cylinders 5 and 6 when i...

so i finally got my truck up and running, but on the test drive there was a loud back fire, driving back home it kept back firing, several times idling at lights and about 5-8 back fires upon accel before i reach 25 mph. i also noticed a huge power loss. checked under the car and theres a large...

so im having some real trouble figuereing whats wrong with my explorer. during a koeo test i get a code 22. but during the koer test i get the codes 12, 13, 21, 32, 64, i used to get a 66 but i replaced my MAF so i no longer get that code. i have also replaced the O2 sensor. when i start her up...

its got about 120,000 miles on it. i recently replaced the alternator and thats when i started having trouble with the volts and black smoke and lurching, i checked the alt and it seems fine, the battery is brand new, but the posts were a little small so my bro cranked the terminals down, it...

My 1991 explorer is posessed i swear! my engine idles rough shaking the whole car and emits black smoke from the tail pipe when i start it that smells horrible and has now painted my curb black. also my volts jump from 10-13 while its warming up and when driving at temperature. when i come to a...