MNOE

Yea mine starts fine, just idles like crap. esp in reverse. When accelerating it goes away though. But yea I've thought bout injectors but they are kinda expensive so i've been trying other things first. Talked with Dave earlier and he was saying that if it was cylinders 3 and 5 misfiring, it may be injector related rather than ignition. However I rechecked and its a random misfire 0300, with cylinders 1 and 5 misfire 0301, 0305. Not sure where I will go from here but ill def post a result if I find one lol.

dave1123

I just had another brain fart! Check your motor mounts. The shaking at idle may be caused by a broken one. That's not going to cure your codes, however.

MNOE

lol, yea I have already. Was one of the first things I checked.

CPLSeraphim

I bought a set of 6 4-hole injectors for the jeep for 80 bucks on ebay. figure I will find out if that's the issue. blew the rear end out of my blazer today. tomorrow looking at a few vehicles in my price range. 97 Jeep Grand or 02 Dodge Durango. both v-8s, whichever is in better shape I suppose. similar miles, similar price point. Wife GC hasn't been up and running yet, her cavalier has a blown motor we were holding off on fixing and now my blazers down. glad I'm a supervisor at work and have a pickup from them or we'd be screwed. lol.

CPLSeraphim

Ok. Looking at a new angle on the Jeep issue. It looks like I may have a bad fuel regulator. Does this sound like a possibility? Fuel tank, pump and filter all changed. Injectors changed. New Spark Plugs. Runs fine on ether and accelerated.


Looking for opinions before throwing another 50 bucks at her. Since we have no running vehicles, this one would be quite nice. Would a bad fuel regulator also cause hot exhaust?

dave1123

A lean fuel mixture will cause high temperatures in the exhaust and I've seen pipes glowing red before. Low fuel pressure will cause a lean mixture but on jeep's 4.0, the fuel regulator is either on top of the pump or in the remote filter, whichever you have. On the V8's (the 5.2 and 5.9), it's on the back of the throttle body.

CPLSeraphim

That's what I was kind of afraid of. Already had my mechanic drop the fuel tank once to replace the whole fuel pump, and we replaced the fuel filter as well... These were replaced after we got rid of the water fuel. It was running before on damn near 3/4 gas 1/4 water... now its fn cleaned up and should run like a damn top... and the thing wont even idle.


its a flood vic, but I don't see the computer being messed up since its been running and all. and this flood designation was a while ago. I have a feeling this is something simple. Probably wouldn't be bad but its at a shop so I can't tinker too much, and my blazers out until next days off... I'm agitated. but it'll all come together.

CPLSeraphim

So I decided to say screw it. This is a flood vehicle, I am getting a new computer flashed for the vehicle. Figure maybe that got damaged in the flooding.

Dirtdiggerjr

Is your distribtor timing right?

MNOE

Said screw it an paid the stealer 100$ to diagnose my issue. Says I might have a cracked head. Don't know if this helps you out any.

CPLSeraphim

Got her running. The new 4 hole injectors helped a lot. New issue now that she is running is when you rev her up she doesn't come down right away, and when it does, it is very slow. I have another thread on this. I have a random miss. Just bought a new coil pack. Hope that fixes that, then she will be ready for the road. finally.

CPLSeraphim

Alright, so it runs, but cant drive. try to, it stumbles all over itself. I bought a fuel line pressure tester. turns out it, while running, is only getting about 16 psi. This is why it started running better with the 4-hole injectors, allows the fuel to pour in and kinda of burn a little. Anyway, putting another new fuel pump in. The last one was a cheapy ebay fuel pump. Guess I won't do that again.


I'll let you know sometime this week if this was the entire problem. After putting over another 500 bucks in it, just to find out it was the fuel pump in the first place.

dave1123

IDK if this story will help you at all, but it's worth sharing. The fuel filler pipe on my '97 Dodge Caravan rusted out, allowing road grit to enter the tank, along with water. I replaced the filler pipe with a homemade one made from exhaust tubing and rubber sections. I siphoned the tank out as much as I could, leaving it mounted, and changed the filter. About a week later, the fuel pump quit. Because of the time factor, I took it to Dodge and they replaced it with a NAPA pump to save me money. Another week and THAT one failed. NAPA went for replacing it at my labor expense and it lasted a month before it started whining. I asked Dodge if they dropped and cleaned out the tank and they hadn't! WTF!! Dodge asked me if I wanted them to put in a Mopar pump and I said no and sold the van, telling the guy the whole story. He got back it me later and told me he cleaned out the tank with kerosene and installed ANOTHER NAPA pump and his daughter has been driving it to college for 3 years! He said he called because I sold it so cheap and it's been a reliable van. Well, thanks buddy!

One thing about flood cars. Water gets into the wiring harnesses and causes havoc with corrosion, especially if it's salt water. Check all your connectors for this.

CPLSeraphim

Yeah, I hear you on that. When taking out the engine and tranny, we looks at as much of the underside wiring, and it was alright. When we swapped fuel tanks, that mother was cleaned out good. Also, as soon as the fuel pump was replaced, it didn't run. POS pump. However, I will update as soon as I hear some news.

Cjjcalhoun

Mine does the same thing when my Map sensor isnt connected. Take a look for a vaccuum leak. Just an idea.