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1988 bronco EFI 351 W FULL SIZE
1 Posts
Discussion Starter · #1 ·
177k, just got month ago. Vegan major tune with cap, rotor, pill change, pvc.
Haven't got to wires and plugs yet, but wire set looks pretty dated and fragile. Fuel filter not in yet, have new shocks to install.
Since shortly after cap and rotor, starts began with periodic slow turn like timing, then start, with initial high idle, leveling out until warmed up. Progressed within days to start, warm and die with no immediate start. Went thru vacuum connections, tightened air box, ect,
Now initial start up running smooth, then sound rough and levels out smooth and back to rough then no start after shut off. Let sit starts hard.
Any knowledge and direction would be greatly appreciated. Reading endlessly on haynes manual both down loaded and book.

1996 bronco, 351w, E4od
233 Posts
Hey could i get some more detail the truck. Like did you just buy it and did it run when you got it. Or you know just a quick summary of what happened or what you have done to it.

Super Moderator
29,153 Posts
Yo Jeff,
Try a Self Test for Diagnostic Trouble Codes by my pal, BroncoJoe19 @ Code Reader.....

PCM stores the Self-Test program in permanent memory. When activated, Self-Test checks the EEC system by testing memory integrity and processing capability, and verifies that various sensors and actuators are connected and operating properly.

Do KOEO test First. Post Code(s) here according to KOEO and KOER.

A helper can assist you by counting the codes. Some use their smart phones to record them.


Or ask local mom and dad parts stores if they will test it for you.

Or purchase a coder reader such as Equus 3145 Innova OBD I Code Reader for Ford EEC IV Engines at Walmart & most parts stores.
Here's the 1988 Ford Bronco & Truck Service Manuals by Larry J via Kingfish999 in Google Drive @ 1988 Ford Truck Service Manuals (Thank you Larry Jorgensen) - Google Drive

1988 Bronco Dealer Brochure @

For any Bronco questions or to chat about it's planned modifications or build, it's better to post each seperately in Noobie Bronco Tech Questions. Flame free zone. This will get more attention and you can build up your post count to get into other sections such as Bronco and Ford Parts/Accessories (75 posts required to participate due to scammers who preyed on our members).
So, I'll move this thread to Noobie section for more visibility.

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