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1986 f150 backfiring, sputtering and almost dying when driven

Okay so when my truck is idling cold its at like 2grand after it warms up its just below 1 when given gas while idling it backfires, and when im accelerating in second gear cause thats as fast as i can get it like acts like its stalling out or dying, but when i get off the gas it like bucks and tries to go. also my friends saw exhaust in the hood and heard a ticking noise. we checked the timing its perfect but my friends seem to think its my exhaust manifold gasket

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

pantywaste33
  • 9 Answers

SOURCE: Car starts, car sputters, and or backfires, and stalls.

check your timing

Posted on May 05, 2009

wyno62
  • 364 Answers

SOURCE: 94 Camaro Z28 Missfire & Backfires

I had a similar problem, took it to get diagnosed and was instructed to give them $1100 because of a faulty reading on the distributer, rather than paying $650 for a unit I found plenty available new for under $200 I bought an OEM for $189. Now the labour can be found cheaper elsewhere. I then discovered that the module may also be at fault but I would have to replace the dizzy first, Then discovered that the Air Flow meter {afm} may need to be taken off and cleaned with a carby cleaning spray, this is a do it yourself fix costing you about $8 a can of cleaner
Unscrew the units clamps and disconnect the plug, I can't stress enough, DO NOT touch the fine wires inside, spray the carbon buildup off the inside and blow/air dry, {do not rinse with water.} reinstall the unit in the reverse of which it was removed, Alternativly you may have fuel blockage in the lines, try replacing the fuel filter {cheapest fix}
Hope this helps

Posted on May 13, 2009

udesh99
  • 97 Answers

SOURCE: Backfires in manifold on motor on acceleration. runs ok low speeds

Nornally reson for backfire is when intake Valve open Internal combustion in Cylinder. Pls Check Your Ignition Timing & Valve Timing. ( I think Your Timing Advancer is Defect )

Posted on Jun 01, 2009

  • 20 Answers

SOURCE: jeep wrangler bucking

how long has this been happing..one tank of fuel or more, could have been bad gas, replace filter,, put gas dryier in fuel tank..if it continues could possibly be transmission related..the reving down doesn't sound like transmission though if tansmission was slipping it would rev up..good luck

Posted on Jun 02, 2009

  • 1 Answer

SOURCE: Sputtering backfiring, stalling randomly when i engage the clutch. help!

everytime i try to start my truck, it turns over then stalls out on me. any idea?

Posted on Jul 10, 2009

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2000 tundra v6 5-speed cold start truck runs great, park it for 20-30 min it will start fine but after going 1/4 mile it dies, looses power. pull over and it will backfire and sputter until it eventua


bad need of a tuneup? like new spark plugs, ?
172 , is 02 rich/ lean warning. this one is low oxy for rich.
this code can just be a victim. for sure , with misfire.
means 02 sensor stuck at rich,
what is water temp in engine coolant, at failure? less than 150F?
could be lots of things.
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injector sticking> causing misfire.
id use a scan tool and watch all sensor when it fails.
too high fuel pressure.
misfires cold, but only luke warm cold starts not fully cold.

just one DTC, no P0300 or 30x misfire codes, not even P0300 pendings?

Jan 31, 2014 | 2000 Toyota Tundra

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Sputters and dies on cold start, significant drop in gas mileage.


You need to rebuild the carburetor or clean the choke linkage and make sure the choke valve closes cold.

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You would need to figure out if the problem is too much air or not enough fuel.
The carb has three internal circuits - - idle, cruise, and accelerate.
Fuel flows thru each circuit from the bowl to the venturi.
You could have a vac leak that is allowing too much air to enter the intake, or the idle circuit on the carb may not be adjusted correctly after the engine warms up.
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the ECU is messed up or the Throttle body is clogged.

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Based on the information provided, it sounds like a bad TPS (Throttle Position Sensor). The TPS controls your idling speed under all conditions. When a TPS goes bad, you will usually notice the vehicle will idle when the engine is cold but once warm or with the AC on, it will sputter or stall.

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The engine sputters and dies when it heats up. Is this Vapor lock? On cold start it works great and idles just fine but as it heats, the engine starts choking and soon dies out. If this is vapor lock, how...


sounds like the reason it starts and idles fine at start up is your choke is functioning... as your vehicle warms up.. the choke starts to kick off... Inspect your throttle body and idle control motor.

Aug 05, 2010 | 1986 Ford Bronco II

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89 f150 runs good when cold shuts off after 20 miles and then has to sit for awhile before it will start and run properly then only runs a short distance and shuts off again. It sounds like its trying to...


It will be either the pick-up coil inside of the distributor is malfunctioning, the Dura-Spark Control Unit is faulty, or the wiring to and around the Dura-Spark Control Unit and running out to the engine is faulty. (I always find these wires on those year Ford trucks to be in very poor condition with a lot of missing wire insulation allowing the bare metal wires to touch each other or to short out on the body ground) The wires should be inspected very carefully and also be certain that you inspect inside of the wire looms for any damaged wires.

You might be able to remove the Dura-Spark Control Unit and have it tested for free at most auto part stores.

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If you were driving a voyager I'd suspect the fuel pump is starting to fail.

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86 mustang 5.0 fuel injected. At cold, starts great and runs stong and firm. After driving about 10-15 mins it starts sputtering and wants to lope and die at idle. Driving, it hardly idles at a stop and...


Your fuel air mixture is wrong. Just like a choke. When it is cold it dumps more fuel in, when it warms up it is supposed to mix in more air. It does not seem to be doing this. You need to have that adjusted. In the meantime you can adjust you idle a little higher. You can do this by adjust a screw where the throttle cable sits on top of the engine.... Please give a good rating, it reaaly means a lot. Please feel free to keep in touch

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1 Answer

My truck doesnt want to idle when its cold


If it is carbarated, adjust the choke to run more richly.

Dec 01, 2008 | 1986 Ford F150 SuperCab

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