Out of ideas....
#1
07-15-2004 | 12:46 AM
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Out of ideas....
Howdy,
I have an 86 F-150 with a 302 that's been giving me fits to say the least. I fixed most of the problems but still have one major one we can't figure out.
1. It started with the idle jumping, a severe power loss, and occasional stalling. I replaced the plugs (all were worn uniformly and not too badly), air filter, fuel filter (frame mounted), distributor cap and rotor, and the battery. It worked okay but idle was still jumping.
2. It ran for a day and then started backfiring. The timing chain had climbed so we replaced it along with both gears. It stopped backfiring.
3. Next it died and wouldn't start. I had the module on the side of the distributor tested and it was fine. I had the ignition coil tested and it was bad. I replaced it. It started but the idle was still jumping and sometimes it would act like it wasn't getting any gas.
4. I had it towed to the Ford dealership to have a diagnostic run. They told me that the MAP sensor, the TPS, the EGR valve, and EGR valve sensor all needed to be replaced. I replaced them. The idle quit jumping but it would still die when I slowed down and sometimes when I hit the throttle it still acted like it wasn't getting gas. They had said that the fuel pressure was fine.
5. Then it hit us that the catalytic converter might be plugged. The muffler was rusted through and it should have been making more noise than it was. When I put my hand near the holes in the muffler I wasn't feeling very much air coming through even when the engine was revved. I took it in to Meineke and they replaced the back converter and the muffler. The back one had definitely been plugged but the front one was fine. It ran much better.
6. Here's the current problem. It runs fine when it's cool. When it heats up it starts acting like it's running out of fuel which it certainly is not. It gets pretty hot and it'll die and won't start again until it's cool and even then it's touchy. It wasn't getting hot before I had the exhaust fixed but it was acting like it was out of fuel. I have a code reader and it's displaying codes 31, 18, and 14.
Does anybody have an idea about what to do next? I'm a broke college student who's putting herself through school by shoeing horses and fixing computers. I have no other wheels and I'm having a hard time getting to school and work. The truck is registered in WY so I don't have to worry about emissions. Please, any suggestions would be greatly appreciated. I'm at my wit's end with that darned thing. Thanks!
- Susan
I have an 86 F-150 with a 302 that's been giving me fits to say the least. I fixed most of the problems but still have one major one we can't figure out.
1. It started with the idle jumping, a severe power loss, and occasional stalling. I replaced the plugs (all were worn uniformly and not too badly), air filter, fuel filter (frame mounted), distributor cap and rotor, and the battery. It worked okay but idle was still jumping.
2. It ran for a day and then started backfiring. The timing chain had climbed so we replaced it along with both gears. It stopped backfiring.
3. Next it died and wouldn't start. I had the module on the side of the distributor tested and it was fine. I had the ignition coil tested and it was bad. I replaced it. It started but the idle was still jumping and sometimes it would act like it wasn't getting any gas.
4. I had it towed to the Ford dealership to have a diagnostic run. They told me that the MAP sensor, the TPS, the EGR valve, and EGR valve sensor all needed to be replaced. I replaced them. The idle quit jumping but it would still die when I slowed down and sometimes when I hit the throttle it still acted like it wasn't getting gas. They had said that the fuel pressure was fine.
5. Then it hit us that the catalytic converter might be plugged. The muffler was rusted through and it should have been making more noise than it was. When I put my hand near the holes in the muffler I wasn't feeling very much air coming through even when the engine was revved. I took it in to Meineke and they replaced the back converter and the muffler. The back one had definitely been plugged but the front one was fine. It ran much better.
6. Here's the current problem. It runs fine when it's cool. When it heats up it starts acting like it's running out of fuel which it certainly is not. It gets pretty hot and it'll die and won't start again until it's cool and even then it's touchy. It wasn't getting hot before I had the exhaust fixed but it was acting like it was out of fuel. I have a code reader and it's displaying codes 31, 18, and 14.
Does anybody have an idea about what to do next? I'm a broke college student who's putting herself through school by shoeing horses and fixing computers. I have no other wheels and I'm having a hard time getting to school and work. The truck is registered in WY so I don't have to worry about emissions. Please, any suggestions would be greatly appreciated. I'm at my wit's end with that darned thing. Thanks!
- Susan
#2
07-15-2004 | 02:46 AM
Senior Member
Joined: Dec 2003
Posts: 558
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31 is EVP circuit below minimum voltage
this could be as simple as a bad evp sensor or its wiring.
14 is Profile Ignition Pickup Circuit Failure
18 is Spark Out (SPOUT) Circuit Open
my theory on 14 and 18 is you left something unplugged after installing distributor or timing the engine when you unplug the spout to set base timing. you could also have some broken wires somewhere.
hope this helps.
this could be as simple as a bad evp sensor or its wiring.
14 is Profile Ignition Pickup Circuit Failure
18 is Spark Out (SPOUT) Circuit Open
my theory on 14 and 18 is you left something unplugged after installing distributor or timing the engine when you unplug the spout to set base timing. you could also have some broken wires somewhere.
hope this helps.
Last edited by Mr_Bentwrench; 07-15-2004 at 03:01 AM.
#3
07-15-2004 | 11:02 PM
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Howdy,
Thanks for replying. I already replaced the EVP. No wires were disconnected. I taped up a couple of wires that might have been shorting out. I also took an old spark plug, hooked it up to the distributor and grounded it and it was getting plenty of spark. Is there anything that you know of that might cause shut off the fuel at high temperature? The smog pump was going out so I just disconnected it but that was in February. Thanks.
- Susan
Thanks for replying. I already replaced the EVP. No wires were disconnected. I taped up a couple of wires that might have been shorting out. I also took an old spark plug, hooked it up to the distributor and grounded it and it was getting plenty of spark. Is there anything that you know of that might cause shut off the fuel at high temperature? The smog pump was going out so I just disconnected it but that was in February. Thanks.
- Susan
#5
07-16-2004 | 01:02 AM
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Thanks. The fuel pressure is at 34psi, though. I have dual tanks and my fuel pumps are in the tanks. I've been running it on the front tank so I just tried running it on the back tank to see if it might be the pump in the front tank. It died again after about 10 minutes. I wonder if both of them went out at the same time.
