jerrydub10
New member
Thats what I'm thinking. I hope it's good so I dont have to tear down the motor again to check the rings.
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98 Turbo (re)build
- Thread starter jerrydub10
- Start date
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jerrydub10
New member
Ok guys compression in cylinders 2 and 6 are good. Sitting in between 150 and 155.
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Diezel
New member
So if you have a shitty running engine, Timing is correct, compression is good, and you have black plugs.... It's pointing to a fuel issue. If it were I, I would be putting a pressure gauge on the fuel rail and seeing if you have a failed regulator leaking down, injectors that are leaking, or incorrect fuel pressure.
jerrydub10
New member
I haven't done a timing light on it so I cant be 100% sure its not timing, but I'll check into the fuel. Ive got brand new injectors in it so I dont think its that, but possibly the regulator. I also just realized when it's revved above 2k it runs fine. It only seems to run rough at idle. I have a video but I have to upload it to YouTube for you to watch it.
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jerrydub10
New member
Diezel
New member
This is helping reinforce my idea of Fuel pressure being the issue. Did you hook up a vacuum line to the Regulator? It will only cause a 5-7 pound difference at idle... But this could be a pointer to the right direction. I would start by checking the fuel pressure and get a baseline established.
jerrydub10
New member
I do have the vacuum line hooked up. I'll have to get the tool to check the fuel pressure.
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jerrydub10
New member
Guys I think I may have made a breakthrough in figuring out this fuel issue... Check out these long term fuel trims.. Points to a vacuum leak doesnt it?
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jerrydub10
New member
It's alive!!!
So I just got back from a pretty long underway a few days ago and started tinkering with the engine again, and yesterday I finally made the breakthrough and its running smooth and ridiculously loud. I took it for some test drives, and drove it to work this morning. Im trying to baby it since it is a fresh rebuild. but she purrs like a kitten. cruises at 75 like nothing and to accelerate past people from 70 to 80 takes about an inch on throttle and itll be there real quick. I really appreciate everyone inputs and advice, I probably couldnt have gotten to this point without all of you. Ill post pics and videos when i get off work tomorrow.
So I just got back from a pretty long underway a few days ago and started tinkering with the engine again, and yesterday I finally made the breakthrough and its running smooth and ridiculously loud. I took it for some test drives, and drove it to work this morning. Im trying to baby it since it is a fresh rebuild. but she purrs like a kitten. cruises at 75 like nothing and to accelerate past people from 70 to 80 takes about an inch on throttle and itll be there real quick. I really appreciate everyone inputs and advice, I probably couldnt have gotten to this point without all of you. Ill post pics and videos when i get off work tomorrow.
Diezel
New member
So what was the break through... I missed your post on 7/22 - And yes, that could have pointed out a vacuum leak, or low fuel pressure.
jerrydub10
New member
SOOO Im going to have to go out on a limb here and say that i'm an idiot. I know there was a couple vacuum leaks, but last night when i was putting my intake back on I noticed one of the spark plug wires looked longer than it should be. so I triple checked the wires setup and the wires coming from two of the coils were swapped. I kicked myself in the ass so hard cause I know I checked that a couple times before.
jerrydub10
New member
Yeah im pretty happy too! now I need to start dressing it back up and getting it all buttoned up so it doesnt look janky. i was kinda nervous driving it last night because ive been driving my mini since it broke down last december haha, its a HUGE difference.
do you happen to know of where I might be able to find a new intercooler piping kit? I dont particularly want to piece it together or frankenstein it. but I will if I have to.
jerrydub10
New member
thank you!! once i get back from deployment i'm going to put some work into it to button some things up and make it pretty again. According to the emails I've been getting from the shops, getting it dyno tuned might be kind of difficult in San Diego, so I may have to do the trial and error way of doing it myself.
jerrydub10
New member
Hey guys I'm back from deployment!! Started putting some more work into the truck.
A couple things I would like some advice on.
On cylinder 6(rear passenger side) I get a misfire once the truck warms up, checked the plugs, all cylinders were running rich Except that one, it was running lean as a mofo. All the injectors were new, but I put one of the older (perfectly working when I took it out) one into that cylinder and replaced all the plugs. Misfire went away for a little bit but now its back. Any suggestions?
Second isnt so much an issue but I have to replace one of my knock sensors (doing both and the wire just to be safe.) And when I removed the lower intake plenum I noticed my brand new gaskets (metal) had some tears in the little rubber gasket material around the holes. Should I replace them or slap some gasket maker on it and call it good? I'm leaning towards replacing them so should I get the conventional gaskets or metal ones again?
Other than those couple issues, she rips at 12 psi.
A couple things I would like some advice on.
On cylinder 6(rear passenger side) I get a misfire once the truck warms up, checked the plugs, all cylinders were running rich Except that one, it was running lean as a mofo. All the injectors were new, but I put one of the older (perfectly working when I took it out) one into that cylinder and replaced all the plugs. Misfire went away for a little bit but now its back. Any suggestions?
Second isnt so much an issue but I have to replace one of my knock sensors (doing both and the wire just to be safe.) And when I removed the lower intake plenum I noticed my brand new gaskets (metal) had some tears in the little rubber gasket material around the holes. Should I replace them or slap some gasket maker on it and call it good? I'm leaning towards replacing them so should I get the conventional gaskets or metal ones again?
Other than those couple issues, she rips at 12 psi.
jerrydub10
New member
Here are some pics
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gamefreakgc
Elite Member
Replace the gasket since some of those passageways hold coolant and you do not want that finding a way into the engine, especially if it pools up if the engine is off. That'd be all sorts of bad.
Did it just stick to the cylinder head when you pull the lower intake manifold off or was it more serious than that like damaged from the start? I can't imagine 12 PSI would be enough to blow out the gasket.
Replace the injector. You are starting to push some serious boost so a lean condition could start melting things.
jerrydub10
New member
Thats what I was figuring, do you have a suggested type or brand for the gasket? And it just stuck to the head ports.
And yeah once it started to have the misfire I parked it, already melted one cylinder on the previous engine haha.
