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So I put my new fuel pump in today, and the truck runs perfect now. When I get on the gas hard it’ll downshift, rev, and accelerate, instead of studdering and slowing down.
I also believe I found the root of the problem with the evap system, when the pump last got replaced, the return and evap lines got switched, causing the evap to draw fuel from the bottom of the tank.So now is the first time I’ve been able to hammer on the gas of this truck since I bought it, and it’s got tons of power for a V6, great for pulling away from f-150’s and ram’s hehe
So I put my new fuel pump in today, and the truck runs perfect now. When I get on the gas hard it’ll downshift, rev, and accelerate, instead of studdering and slowing down.
I also believe I found the root of the problem with the evap system, when the pump last got replaced, the return and evap lines got switched, causing the evap to draw fuel from the bottom of the tank.So now is the first time I’ve been able to hammer on the gas of this truck since I bought it, and it’s got tons of power for a V6, great for pulling away from f-150’s and ram’s hehe
Yes, it hits 60 key on, the drops to 55 when the pump stops. Idles at 50 psi. It won’t rev past 3500 rpm and starts misfiring a bit and surging, the fuel pressure surges above and below 50.
These trucks are supposed to be at 60 psi, 55 at the lowest, and I believe the popet valve injectors won’t open below 50.
I also put in a new fuel filter, and no difference.
Yes, it hits 60 key on, the drops to 55 when the pump stops. Idles at 50 psi. It won’t rev past 3500 rpm and starts misfiring a bit and surging, the fuel pressure surges above and below 50.
These trucks are supposed to be at 60 psi, 55 at the lowest, and I believe the popet valve injectors won’t open below 50.
I also put in a new fuel filter, and no difference.
I think I’ve narrowed this down to the fuel pump and not the cat. I got a vacuum gauge, and measured vacuum. With the rpms steady at about 2500, the vacuum was good, and stayed there, and didn’t drop off.
I can’t remember how much vacuum it was pulling, but the gauge I was using says on it what the normal zone is, and it was in it. I put in new AC Delco plugs, and swaped in a different coil, along with the new cap and rotor I put in a few weeks ago.I found a cheap fuel pump online, (prime choice auto), for $55 plus tax, free shipping. I think the local prices are around $200-3.
I know it’s probably not going to be a long lasting pump, but I’d rather put in the cheap one and find out that’s not my problem, just in case it isn’t.I think I’ve narrowed this down to the fuel pump and not the cat. I got a vacuum gauge, and measured vacuum. With the rpms steady at about 2500, the vacuum was good, and stayed there, and didn’t drop off.
I can’t remember how much vacuum it was pulling, but the gauge I was using says on it what the normal zone is, and it was in it. I put in new AC Delco plugs, and swaped in a different coil, along with the new cap and rotor I put in a few weeks ago.I found a cheap fuel pump online, (prime choice auto), for $55 plus tax, free shipping. I think the local prices are around $200-3.
I know it’s probably not going to be a long lasting pump, but I’d rather put in the cheap one and find out that’s not my problem, just in case it isn’t.I wouldn’t glob it on, but a little bit shouldn’t hurt. “open” lug nuts tend to rust and stick bad, way worse than ones covered with a hub cab, or an “acorn” style nut where the ends of the threads are covered.
I had lug nuts stick so bad once that before the stud broke, or the nut came loose, the stud stripped in the hub, which left me with 3 un-removable nuts that had to be drilled out… and that was only after just one winter of driving… there’s nothing worse than salt…I wouldn’t glob it on, but a little bit shouldn’t hurt. “open” lug nuts tend to rust and stick bad, way worse than ones covered with a hub cab, or an “acorn” style nut where the ends of the threads are covered.
I had lug nuts stick so bad once that before the stud broke, or the nut came loose, the stud stripped in the hub, which left me with 3 un-removable nuts that had to be drilled out… and that was only after just one winter of driving… there’s nothing worse than salt…I had the canister off, and it didn’t seem to have much for a fuel in it. I do get some gas coming out of the vent line sometimes which I didn’t think was right. Usually around the same times the truck would act up tho, so that defiantly had something to do with it.
I started concentrating on the clogged cat, and I’m thinking now that might not be the problem. It still loses power at high rpm, but it doesn’t run as smoothly when it hits it’s rpm “cap” like my other truck with a clogged cat did. In neutral it’ll hit about 3500, and start surging a bit, and sounding like it’s misfiring.
I took it for the drive, and held it to the floor for a ways to see how hot the cat got, it seemed pretty warm, but I also got 4 engines codes. 1 for random misfire (P0300), and 3 O2 sensor codes (P0131, P0143, and P0151). I’ve heard a lean condition can cause this, so I’m thinking maybe a weak pump or regulator.
I know a clogged cat can cause O2 sensor codes as well, but that can also cause a MAF and other codes which I have yet to see.
I was going to buy a vacuum gauge and do some tests to check for a clogged cat, but neither of the 2 canadian tire’s in the city had one in stock.Also the truck seems to make great power at the low rpms, and doesn’t have any other performance problems. It starts very easily, in a second of cranking or less, and that’s going straight from the off position to the start position, so not letting the fuel pump build up first.
I had the canister off, and it didn’t seem to have much for a fuel in it. I do get some gas coming out of the vent line sometimes which I didn’t think was right. Usually around the same times the truck would act up tho, so that defiantly had something to do with it.
I started concentrating on the clogged cat, and I’m thinking now that might not be the problem. It still loses power at high rpm, but it doesn’t run as smoothly when it hits it’s rpm “cap” like my other truck with a clogged cat did. In neutral it’ll hit about 3500, and start surging a bit, and sounding like it’s misfiring.
I took it for the drive, and held it to the floor for a ways to see how hot the cat got, it seemed pretty warm, but I also got 4 engines codes. 1 for random misfire (P0300), and 3 O2 sensor codes (P0131, P0143, and P0151). I’ve heard a lean condition can cause this, so I’m thinking maybe a weak pump or regulator.
I know a clogged cat can cause O2 sensor codes as well, but that can also cause a MAF and other codes which I have yet to see.
I was going to buy a vacuum gauge and do some tests to check for a clogged cat, but neither of the 2 canadian tire’s in the city had one in stock.Also the truck seems to make great power at the low rpms, and doesn’t have any other performance problems. It starts very easily, in a second of cranking or less, and that’s going straight from the off position to the start position, so not letting the fuel pump build up first.
So I finally got this figured out. The problem was with the evap system, and when it got into the purge cycle, it would suck in straight gas.
For now I unplugged the electrical connection from the purge valve, and unplugged the vent line from the tank off the canister so the tank can still vent.
So now the truck is running great, doesn’t even bring up and engine code. Still gotta deal with that clogged cat tho.So I finally got this figured out. The problem was with the evap system, and when it got into the purge cycle, it would suck in straight gas.
For now I unplugged the electrical connection from the purge valve, and unplugged the vent line from the tank off the canister so the tank can still vent.
So now the truck is running great, doesn’t even bring up and engine code. Still gotta deal with that clogged cat tho.I fixed my second fuel like leak last night, this was the one in the return line, the other leak was that evap line.
I pulled the canister as well to see if there was any gas in it, and there was some, enough to hear is sloshing around when I shook it. I’m guessing that little bit is normal?
I’ve noticed that the truck acts up at about the same place while going to work, almost every morning, and seems to be a little further down the road on colder mornings, so it’s something to do with the engine temp triggering something. It happens after almost 5 minutes of driving.I’ve noticed that the truck smokes when it acting up, it looks like blue or black, but it’s hard to tell with the sun shinning from behind me, and while I’m trying to drive in busy traffic haha