88 Bronco II - Intermittently Stops Running
#1
88 Bronco II - Intermittently Stops Running
I have a 1988 Bronco II with 2.9 EFI engine, 5 speed manual,4WD, all original with 160,000 miles. For the last two months the engine stops running intermittently. Usually after waiting 5-10 minutes, it starts and runs fine, and most of the time does not give my any more problems the rest of the day. Although sometimes it will stop several times within a couple of miles and other time runs fine for over a week. It does this in wet or dry weather, cold or hot days, up hill, down hill, on curves, straight roads, after driving 2 miles or 20 miles. Once it stopped while sitting at a traffic light. I have change the fuel filter, have gas pressure at the manifold, changed the distrubitor, pickup, ICM, cap, rotor, plugs, wires, and both relays on the fender by the air filter. Also, while it ususally restarts after 5 or 10 minutes, it has let me sit for over 30 minutes several time and once for over an hour. There is no preamble to it stopping, the engine just dies and after a while it starts and runs fine. Any input would be greatly apprciated.
#2
#4
Originally Posted by Ergoittiam
I just got a code reader to check that, and yes there is spark and fuel pressure
My BII is getting close to 160,000 miles and, in fact, I just ordered one of these modules to keep as a spare as this seems to be a really common fault at around this mileage. It's scheduled to arrive tomorrow.
#6
If it has spark and fuel pressure, then --
1) Is the fuel pressure correct (40 psig KOEO)?
2) Are the fuel injectors firing?
3) Is the spark at approximately the right time?
4) Is the spark getting to all/most cylinders?
5) Do the cylinders have compression?
6) Something blocking the air intake?
7) Did you get a chance to pull codes?
1) Is the fuel pressure correct (40 psig KOEO)?
2) Are the fuel injectors firing?
3) Is the spark at approximately the right time?
4) Is the spark getting to all/most cylinders?
5) Do the cylinders have compression?
6) Something blocking the air intake?
7) Did you get a chance to pull codes?
#7
I had a similar problem on my 88 Bronco II, mine turned out to be the fuel pump inertia switch. This switch is located in the floor board on the passenger side. The problem wasn't the switch but the electrical connection is in a positon that someones foot can rest against it causing it to have a bad connection and thus shutting off the fuel pumps. When the engines shuts off reach over and jiggle the wires to see if it may be your problem. I replaced the switch and the wires with one from a 1987 Taurus, which is located in the trunk. I also made a sheet metal guard to keep feet off of the wiring. This solved my problem, I hope it will help you.
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