- Joined
- Jun 13, 2016
- Messages
- 134
- Reaction score
- 40
- Points
- 28
- Location
- Connecticut
- Vehicle Year
- 1989
- Make / Model
- Bronco ii
- Engine Type
- 2.9 V6
- Engine Size
- 2.9L
- Transmission
- Manual
- 2WD / 4WD
- 4WD
- Total Lift
- 6
Hi guys, it's been a while since I posted about my truck. This past winter the pig died on me at a gas station, crank no spark. Got it towed home and after some inspection found a suspect-looking ignition coil power wire. After I fixed that the truck would start sometimes but kind of struggle for a second or 2 then run. I counted this as a win and left it alone through the spring and early summer, just moving it around the driveway and running it from time to time. So I got more time and I wanted to tackle it again, I noticed that the truck would still struggle to start and would crank a few times more than usual then splutter to life. The FP was making all kinds of money noises so I dropped the tank and replaced the whole unit, found out it basically imploded in the tank. So I'm thinking to myself that I've fixed my problem...no. Still spluttering but running much better, so I go and do a fuel filter, plugs, check all my connections and get no real change. the only thing that changed was that the truck would start better, not like before, but better. For the past 3 years, the motor would crank MAYBE 2 times then start, it always started too fast in my opinion and I have a pile of starters with chewed-up Bendix gears to prove it. So when I started like a normal car I took notice of it pretty quick. Again I left the truck alone for the rest of the summer but this week I've been messing with it, here's what I've found.
-KOER FP 30PSI
-KOEO FP primed 35PSI
-checked FP regulator, seemed to be working correctly, no fuel smell or leaks
-After shutting off the engine the FP will creep up to 35psi then drop to zero overnight, BUT prime right back to 35 with one key cycle
-the truck will run cold fine, but as soon as it's off high idle it seems to hunt around very slightly and run rough
-code for the coolant temp sensor comes and goes intermittently
-if left to idle it will sometimes just surge up and down and die, RPMs drop low then it seems to try to catch itself
-once it comes off high idle it will surge up and down a few times then even off at the correct RPMs (doesn't always do this)
-checked IAC, working correctly
-swapped around relays
-messed with the inertia switch
-gave the harness the ol jiggle test
-drank a beer
-tried all previous steps one more time for good measure
the last piece of the puzzle is as follows. last winter when I was still driving it I had noticed that the truck would do the little surge BS on occasion but run fine afterward, seemed to come and go, but usually soon after startup. This was also coupled with the fact that sometimes it would start funny and splutter to life for a second (did this the day it died). Given that no spark condition last year and the strange idle I'm thinking ICM on the dizzy. I've gone through 2 before for other reasons but I'm still thinking that might be my culprit, or possibly the temp sensor but that doesn't explain the startup splutter. lastly, I hooked up my FP gauge to the rail and watched that when it surges and falls the FP does not drop, this leads me to believe that the surging and spluttering is not caused by a fuel issue. Ide love to hear your thoughts after reading this essay of a post.
-Jonathan
-KOER FP 30PSI
-KOEO FP primed 35PSI
-checked FP regulator, seemed to be working correctly, no fuel smell or leaks
-After shutting off the engine the FP will creep up to 35psi then drop to zero overnight, BUT prime right back to 35 with one key cycle
-the truck will run cold fine, but as soon as it's off high idle it seems to hunt around very slightly and run rough
-code for the coolant temp sensor comes and goes intermittently
-if left to idle it will sometimes just surge up and down and die, RPMs drop low then it seems to try to catch itself
-once it comes off high idle it will surge up and down a few times then even off at the correct RPMs (doesn't always do this)
-checked IAC, working correctly
-swapped around relays
-messed with the inertia switch
-gave the harness the ol jiggle test
-drank a beer
-tried all previous steps one more time for good measure
the last piece of the puzzle is as follows. last winter when I was still driving it I had noticed that the truck would do the little surge BS on occasion but run fine afterward, seemed to come and go, but usually soon after startup. This was also coupled with the fact that sometimes it would start funny and splutter to life for a second (did this the day it died). Given that no spark condition last year and the strange idle I'm thinking ICM on the dizzy. I've gone through 2 before for other reasons but I'm still thinking that might be my culprit, or possibly the temp sensor but that doesn't explain the startup splutter. lastly, I hooked up my FP gauge to the rail and watched that when it surges and falls the FP does not drop, this leads me to believe that the surging and spluttering is not caused by a fuel issue. Ide love to hear your thoughts after reading this essay of a post.
-Jonathan