1995 F150 running very rough, maybe too rich and vacuum problems
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Mountain Pass
Joined: Nov 2013
Posts: 242
Likes: 7
1995 F150 running very rough, maybe too rich and vacuum problems
Hello! I just bought a 1995 F150 4x4 with 351W automatic hubs and E4OD trans. Truck has 110K miles. I just got it home today, bought it as a non-runner. Only info I could get from the previous owner was that the truck suddenly died and he couldn't figure out the problem and the truck has sat since with a crank/no start.
It has shorty headers, deleted EGR, deleted thermactor, deleted EVAP system, deleted cats, and some signs of hack electrical work under the hood lol.
I was able to get the truck to start and run by adjusting the distributor, and it runs like crap, very rough slow idle, no power at all. When opening up the throttle, it wants to stall, no rpm increase.
I hooked up a vacuum gauge and it barely has vacuum like 3 inches. Otherwise, no knocks, no smoke. The only codes were EGR and purge solenoid related. Interestingly, I pulled the vacuum hose off the brake booster and the truck began to idle better, which made me think it might be running too rich since leaning it out improved it.
Does anyone know if this sounds like a timing chain that jumped a tooth? I'm not even sure if the engine would run one tooth off in timing. Thoughts?
It has shorty headers, deleted EGR, deleted thermactor, deleted EVAP system, deleted cats, and some signs of hack electrical work under the hood lol.
I was able to get the truck to start and run by adjusting the distributor, and it runs like crap, very rough slow idle, no power at all. When opening up the throttle, it wants to stall, no rpm increase.
I hooked up a vacuum gauge and it barely has vacuum like 3 inches. Otherwise, no knocks, no smoke. The only codes were EGR and purge solenoid related. Interestingly, I pulled the vacuum hose off the brake booster and the truck began to idle better, which made me think it might be running too rich since leaning it out improved it.
Does anyone know if this sounds like a timing chain that jumped a tooth? I'm not even sure if the engine would run one tooth off in timing. Thoughts?
Fleet Mechanic
Joined: Oct 2025
Posts: 1,873
Likes: 408
Hello! I just bought a 1995 F150 4x4 with 351W automatic hubs and E4OD trans. Truck has 110K miles. I just got it home today, bought it as a non-runner. Only info I could get from the previous owner was that the truck suddenly died and he couldn't figure out the problem and the truck has sat since with a crank/no start.
It has shorty headers, deleted EGR, deleted thermactor, deleted EVAP system, deleted cats, and some signs of hack electrical work under the hood lol.
I was able to get the truck to start and run by adjusting the distributor, and it runs like crap, very rough slow idle, no power at all. When opening up the throttle, it wants to stall, no rpm increase.
I hooked up a vacuum gauge and it barely has vacuum like 3 inches. Otherwise, no knocks, no smoke. The only codes were EGR and purge solenoid related. Interestingly, I pulled the vacuum hose off the brake booster and the truck began to idle better, which made me think it might be running too rich since leaning it out improved it.
Does anyone know if this sounds like a timing chain that jumped a tooth? I'm not even sure if the engine would run one tooth off in timing. Thoughts?
It has shorty headers, deleted EGR, deleted thermactor, deleted EVAP system, deleted cats, and some signs of hack electrical work under the hood lol.
I was able to get the truck to start and run by adjusting the distributor, and it runs like crap, very rough slow idle, no power at all. When opening up the throttle, it wants to stall, no rpm increase.
I hooked up a vacuum gauge and it barely has vacuum like 3 inches. Otherwise, no knocks, no smoke. The only codes were EGR and purge solenoid related. Interestingly, I pulled the vacuum hose off the brake booster and the truck began to idle better, which made me think it might be running too rich since leaning it out improved it.
Does anyone know if this sounds like a timing chain that jumped a tooth? I'm not even sure if the engine would run one tooth off in timing. Thoughts?
Did you use a timing light? If not, pull spout connector and use a timing light, set to 10 btdc.
Thread Starter
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Mountain Pass
Joined: Nov 2013
Posts: 242
Likes: 7
I set the timing pretty much in the only spot it will run, if I retard or advance it even a tiny bit, the engine stalls out completely.
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