1079 F150 Weird Problem
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Joined: Nov 2005
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1079 F150 Weird Problem
Hello All
I am having a very strange problem with my f150. I can't seem to get the truck to run properly! I have double checked the firing order. I start the truck and it idles ok but when I put the truck into gear it has no power. Now for the strange part when I change the firing order 7,4 the truck runs but backfires. Does anybody have any ideas.
I am having a very strange problem with my f150. I can't seem to get the truck to run properly! I have double checked the firing order. I start the truck and it idles ok but when I put the truck into gear it has no power. Now for the strange part when I change the firing order 7,4 the truck runs but backfires. Does anybody have any ideas.
Elder User
Joined: Jan 2003
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From: Baltimore
When was the timing chain replaced in that motor? I am wondering if it didn't jump a tooth or maybe more. That would explain your loss of power and the backfiring.
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I will check all the wires and plugs today. The truck was sitting for 5 years before I got it. It only has 70,000 origional miles on it. I have installed all new plugs, wires, cap, rotor and I have also installed a new carburetor.
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From: East Bend, Carolina, U.S
What do the spark plugs look like now since they were installed (clean, sooty, fouled, etc...)? Take them out and see what they look like. Note any differences between them.
If you have not tried disconnecting and plugging all of the accessory vacuum lines and brake booster vacuum hose (if equipped) then you should. Just look for a change in the engine's performance even if the main problem turns out to be something else, a small vacuum leak does add to other bigger problems.
If you have not tried disconnecting and plugging all of the accessory vacuum lines and brake booster vacuum hose (if equipped) then you should. Just look for a change in the engine's performance even if the main problem turns out to be something else, a small vacuum leak does add to other bigger problems.
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I double checked the plugs and wires and everything was fine. I did check all the vacumm lines to the carb. I unpluged all of them and don't notice any differance in the truck. The truck seems to run the same with none of the vacumm lines conected.
Last edited by fr8tra1n; Nov 28, 2005 at 05:29 PM.
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Joined: Feb 2005
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From: Lower Mainland B.C.
EGR valve stuck? Is there an air pump on the front of the engine that could be non-functional? Distributor bearings wore-out? Thermostat stuck? Little grey circuit board box on drivers side fender need to be replaced?
Fleet Mechanic
Joined: Feb 2005
Posts: 1,782
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From: Lower Mainland B.C.
An air pump is cylindrical with a pulley on the front, it will have a belt on it just like an alternator, I think FORD mounted it under the alternator on the pass side, I think it is supposed to add air to the egr system to help better burn the recirculated crankcase vapors, I just took mine off as it wasn't working. If you have a charcoal emmissions canister, it might be plugged as well, again I just "deleted" mine from the system and the truck ran fine as well as passing our government AirCare testing - get this, I removed those 2 things and my exhaust emissions DROPPED! 
My 1981 oldsmobile car HAD an emissions canister as well and it was always hard to start and I had to wait for 5 minutes before putting it in gear to make sure it wouldn't stall, well I "deleted" my emissions canister and that solved BOTH problems! as well as again I had LESS emissions during the AirCare testing
My 1981 oldsmobile car HAD an emissions canister as well and it was always hard to start and I had to wait for 5 minutes before putting it in gear to make sure it wouldn't stall, well I "deleted" my emissions canister and that solved BOTH problems! as well as again I had LESS emissions during the AirCare testing