Help needed!
I can start up my 87 Bronco 2 XLT, with a 2.9 fuel injected V6 and it runs great, smooth and steady. That is, till the temperature of the engine warms up 5 or 6 miles maybe. Then it will start surging under load and missing like crazy. Now while driving and staying in drive, I can turn off the switch and immediately turn it back on and everything is fine, for another 2 to 3 miles. Then the symptoms start again. Sometimes I can press down the accellerator till it drops a gear and it will catch and run smoothly again, momentarily, then back to the surging again. When it's cruising straight and level, at a steady throttle and it starts missing you can feel the surge kind of come and fade like a cycle up and down. When this surging happens it shows signs of flooding. Black smoke from exhaust. It's like something that resets after a re-start but then goes haywire after a couple, or 3 minutes.
Checked my codes and got an 18 and 33. Egr not opening and spout connection.
Here's what I have done. Replaced Ignition Module, replaced distributor pick up module, and cleaned connections(no change). Replaced EGR vacumn switch. Checked and replaced most vacumn hoses and connections. Cleaned and checked EGR, (no change). Replaced MAP (no change) Replaced throttle position sensor (no change). Replaced air by-pass assembly (no change). Replaced engine temperature sensor, (no change). Checked fuel pressure 32 lbs and constant, running. Replaced fuel filter (no change). Replaced ECM (no Change). Cleaned throttle body (no change). Ran 2 cans of injector cleaner through it (no change). Checked vacuum and it shows 20lbs at idle. Vacuum drops to 10 to 12 during the episodes.
Well as you can see I have ******* a tidy sum throwing parts at this thing and (no change).
Sure hope somebody has an answer here. This must be a common problem. Not only do I have this problem with this B2, but I have a second 87 B2 that I parked last year and it was doing the exact same thing!
How about it guys, jump in here and tell me what I'm missing! All ideas appreciated.
Thanks for any help.
Ron
I can start up my 87 Bronco 2 XLT, with a 2.9 fuel injected V6 and it runs great, smooth and steady. That is, till the temperature of the engine warms up 5 or 6 miles maybe. Then it will start surging under load and missing like crazy. Now while driving and staying in drive, I can turn off the switch and immediately turn it back on and everything is fine, for another 2 to 3 miles. Then the symptoms start again. Sometimes I can press down the accellerator till it drops a gear and it will catch and run smoothly again, momentarily, then back to the surging again. When it's cruising straight and level, at a steady throttle and it starts missing you can feel the surge kind of come and fade like a cycle up and down. When this surging happens it shows signs of flooding. Black smoke from exhaust. It's like something that resets after a re-start but then goes haywire after a couple, or 3 minutes.
Checked my codes and got an 18 and 33. Egr not opening and spout connection.
Here's what I have done. Replaced Ignition Module, replaced distributor pick up module, and cleaned connections(no change). Replaced EGR vacumn switch. Checked and replaced most vacumn hoses and connections. Cleaned and checked EGR, (no change). Replaced MAP (no change) Replaced throttle position sensor (no change). Replaced air by-pass assembly (no change). Replaced engine temperature sensor, (no change). Checked fuel pressure 32 lbs and constant, running. Replaced fuel filter (no change). Replaced ECM (no Change). Cleaned throttle body (no change). Ran 2 cans of injector cleaner through it (no change). Checked vacuum and it shows 20lbs at idle. Vacuum drops to 10 to 12 during the episodes.
Well as you can see I have ******* a tidy sum throwing parts at this thing and (no change).
Sure hope somebody has an answer here. This must be a common problem. Not only do I have this problem with this B2, but I have a second 87 B2 that I parked last year and it was doing the exact same thing!
How about it guys, jump in here and tell me what I'm missing! All ideas appreciated.
Thanks for any help.
Ron