Fuel injection flooding
Thread Starter
|
New User
Joined: Jun 2004
Posts: 10
Likes: 0
Fuel injection flooding
I have an 86 Bronco 302 with fuel injection. The engine started running rough and missing badly.After replacing cap,rotor,plugs, and wires it still ran badly. I noticed that there was an insane amount of fuel consumption to the rate of half tank in 40 miles or roughly 3-4 miles a gallon and that large amounts of raw fuel is being kicked out the exhaust. I didn't think it was possible for fuel injection to flood.Any help is greatly appreciated.
Senior User
Joined: Nov 2003
Posts: 167
Likes: 0
From: vancouver bc
for milage that bad something is horribly wrong like an injecter stuck open dumping fuel into the engine. if all else fails get your injecters tested and cleaned, its usualy good for a big more power to
Elder User
Joined: Oct 2004
Posts: 759
Likes: 0
From: Omaha
Sounds like your injectors are stuck. I had that same problem on my probe. First I would buy a good bottle of injector cleaner like red line or any other good brand fill it up with premium and see if you can beak them open with the higher octane and cleaner.
Senior User
Joined: Dec 2004
Posts: 107
Likes: 0
Leaky injector.
They should be 19# injectors (orange). It might be cheaper to get new or low-mileage take out injectors that it would be to get yours cleaned/serviced/tested. Look at eBay, Mustang message boards, or at worst a set will be $210 from a high-performance catalog (i.e. summit racing-- get the Ford Racing Performance Parts ones).
They should be 19# injectors (orange). It might be cheaper to get new or low-mileage take out injectors that it would be to get yours cleaned/serviced/tested. Look at eBay, Mustang message boards, or at worst a set will be $210 from a high-performance catalog (i.e. summit racing-- get the Ford Racing Performance Parts ones).
Posting Guru
Joined: Jan 2004
Posts: 1,232
Likes: 0
Trending Topics
Junior User
Joined: Jun 2004
Posts: 70
Likes: 0
onetime try this first before you go sinking a lot of money in injectors. Replace the coolant temp sensor (for the ecm). When these fail they can and do give the ecm wrong info like that the coolant is at -32F (example) this causes the ecm to dump an insane amount of fuel into the chambers richning up the mixture. It'll run like poo until you replace the bad sensor. I had a g-marquis in my shop years ago just like what you described. Other shops had replaced everything and I mean EVERYTHING else on this poor ladies engine except the coolant sensor. They are cheap .... try it first. Just my $.02
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
10 Fords to Drive Before You Die
Joe Kucinski
3 Best / Worst Features Of The 2025+ Ford Expedition
Brett Foote
10 Ways Ford is LOSING to the Competition
Joe Kucinski
Top 6 Best Deals Available on New Fords & Lincolns Right Now
Brett Foote
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Verdad Gallardo
Top 10 Fords at 2026 Carlisle Ford Nationals
Joe Kucinski
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
Lead Driver
Joined: Nov 2002
Posts: 9,558
Likes: 45
From: Concord, NC
Don't just throw parts at it hoping to fix the problem - with EFI that can get expensive in a hurry, and might not solve the problem. You can test the sensors with a volt meter to see if any are giving incorrect readings. You should still be able to pull the codes from the computer yourself, even on an '86. You will have to use an analog volt meter to read the codes since I'm guessing there is no check engien light in the dashboard. http://fordfuelinjection.com/index.php?p=13 has instructions for how to pull the codes. Instead of grounding STI to the chassis, you can just jump it to sig-rtn, and it'll do the same thing.
Moderator
Joined: Dec 2001
Posts: 22,436
Likes: 17
From: Louisville,Ky.
First, Check the vacuum line to the MAP sensor. If you lose vacuum to the MAP sensor, it will run way too rich.
Next, remove the vacuum line from the fuel pressure regulator.If the diaphram is bad, it will suck raw fuel into the engine thru the vacuum line. There should be no fuel in the line.
Good luck.
Next, remove the vacuum line from the fuel pressure regulator.If the diaphram is bad, it will suck raw fuel into the engine thru the vacuum line. There should be no fuel in the line.
Good luck.
Thread Starter
|
New User
Joined: Jun 2004
Posts: 10
Likes: 0
Alright I went and pulled the codes.This is what I got.
1>Throttle position sensor signal out of voltage specifications
2>EGR valve position sensor not in closed position or voltage incorrect
3>Unable to raise idle
4>Map sensor signal voltage out of specification or not at normal vacuum levels
5>Exhaust gas oxygen sensor reads always running rich
6>EGR valve is not opening or is not closed properly
7>Insufficient manifold vacuum change detected during dynamic respone test
Well those are the codes...Any ideas?
1>Throttle position sensor signal out of voltage specifications
2>EGR valve position sensor not in closed position or voltage incorrect
3>Unable to raise idle
4>Map sensor signal voltage out of specification or not at normal vacuum levels
5>Exhaust gas oxygen sensor reads always running rich
6>EGR valve is not opening or is not closed properly
7>Insufficient manifold vacuum change detected during dynamic respone test
Well those are the codes...Any ideas?
