Need to find help on this problem

[1993TalonTsiAWD]

I found out the plugs,ecu,plug wires,fuel filter,bad gas, fuel injector,fpr,o2 sensor,coil packs,transister, and other ignition componets,timing,alt,boost leak,and battery connections weren't the problem. It still studders and hesitates not only at WOT, and just when you try and give it some throttle. I pulled all the plus at least 20 times now, and last time I did 1-2-4 are all white. I was driving the other day and in 2gear I was going up a hill and it wouldn't get past 2 grand. I pull into a parking lot and the power is back a little now, just when I go to give it some gas, it doesn't want to mover very well. Can a dieing fuel pump do this. Usually when one goes it goes all at once, but maybe it's the fuel pump, how can I test it? I know about the plug behind the battery, but I ant to know how to test how it does in the upper rpm, to see if it delivers enough fuel, If this isn't it, what could it be I have replaced almost everything. Can a clugged cat rev ok at idle and kill power under load? I'm running out of ldeas and sanity for the car, all I want to do is drive it, but this problem has been around for 3 weeks now, and hasn't driven very far at all.

thanks for any help,
Derek

 

[86MCSS]

If you think your cat is plugged unbolt your exhaust after the O2 housing and run it like that. The exhuast will be free flowing and should not be restricted in any way.

If that doesnt work try a compression and leak down test. After that get back to us.

 

[1993TalonTsiAWD]

compression good 155-160 across the board. What else should I check, and how do I see how much pressure my fuel pump is putting out. It just has no go. even if you downshift it still takes for ever. Doesn't smoke too bad, and the new head and t-belt have 27miles on them

thanks Derek

PS don't have a way to do a leak down test quite yet,

 

[86MCSS]

Check your cat. I had this happen to an ex girlfriends camaro. The got clogged and pushed the exhaust gas back in to the headers causing it not to run normal.

Like i said unbolt your exhaust after the 02 housing and see if it stops the problem.

If that doesnt work use a multi meter to test your fuel pump. Im not sure what voltage it would be but im sure you can look it up.

 

[1993TalonTsiAWD]

Just went and did a compession test again. #1=149 #2=151 #3=155 #4=155 the shop that did it said 155-160 across the board, but it's not, but it is within 15% of each other so I think it will be fine.

Would a clogged cat cause it to run ok sometimes and crappy the next

thanks Derek

Ps I would like to test the fuel pressure to the fuel rail, I know the pump works

 

[InjenTalon96]

what kind of plugs are u using, i hope u have NGK in there, because i bosch plugs are garbage and would do something like that

 

[1993TalonTsiAWD]

NGK all the way. I'm not to sure about the wires though, there a carquest special and they seem to be falling apart. The boot came off the wire a bit, I think I may pick up a better set, but those were 50 so you would think they would be ok, maybe not. It wasn't my choice, the shop I took it too put them on , because I was tired of it after rebuilding it, and trying to chase the problem down I figured they could find it with the comp, or other tool, but 500 later they told me they wern't so great with

Thanks Derek

 

[falcone4g63]

do you have a logger or anything that you could see if you are getting knock?

 

[turbodagain]

does you ecu have any stored codes? I would definately do a boost leak test if you have not already.

when and how did this problem start occuring?

 

[1993TalonTsiAWD]

no logger yet, working on that. They said it had no codes stored, and nether did the other ecu I put in. It started since I bought it with a broken t-belt. After I put the new head, water pump, evo manifold,t-belt parts, and all new top end gaskets it did it, at first it was way out of timing, because they guy that did it didn't know how to time it, and I don't own a timing light yet. It had two spark plugs wih bent electrodes, but they are fine now. When I pull them, they can be white, or black, or in the middle. Once I fixed they t-belt and got it running right it will run like crap. At first when you got on it it would studder over 4-5k then and run like crap. until I restared it. Now it runs ok, but seems like there is no power up hill. The last time I had it out I was driving, and in second it wouldn't go over 2k no matter how much gas I gave it. Could ding up pistons from the valves hitting cause it to detonate to pull timing back this far??? It ticked and smoked for it's first 10miles after rebuild, and noe has stopped and runs ok. It ill rev fine in nutral, but with a load it doesn't want to move. I did a boost leaks test and all I got was a leak around the turbo inlet, but can't find it, and a huge leak out the dip stick. I thought the PCV valve was stuck letting air into the head and crank, but it still lets air into the head and crank case. Starting at the turbo inlet. I had to send my boost guage in to get it fixed, because it wouldn't zero out. I tried to set it and a white plastic piece fell off inside. So I'm waiting for that. I just to figure this out. One more thing the egt tap I had put in the manifold may leak a bit would this hurt preformence that bad, and would a clogged cat or any exhust part cause it to rev fine nutral then crappy with a load?? I really haven't even got to 3 or 4 or 5 gear, because it falls on it's face in 2 and 3 then I have to down shit to 2 and it gets a little more power, but not what it should be. Also when it runs right it does pull hard and I can hear the turbo spooling not wining. I wonder if it could be the tranny or clutch or somthing..at this point I have no idea so any ideas would help, shold I try replacing the MPI under the radio.

thanks Derek

 

[1993TalonTsiAWD]

Well I still haven't got anywhere, but I think the engine part is ok. It idles fine, in fact it's about 30 degrees right now and I went to start it, it started right up and idle at 1500-2000 for about 5-10 sec. then came down to 1000 on the dot. It revs very smooth and fast not laggy or studdery. I think my problem lies somewhere in the turbo system. The question is what. When I did a boost leak I found out it was going to the bootm end, that usually means bad rings, but the compression was pretty good so I don't think it's that. I did read that thr turbo seals if bad let air through the hot side right into the bottom end. The reason I know it's gettin there is the fact it's leaking around the dip stick, If it was the turbo would it causing to have no power at all sometimes, and then power atother times?? I do see a little smoke out the tail pipe, but it's not really blue or white. Also someone told me if I rev it in nutral and let off at 4-5k i should hear the bov a bit, but I can't hear it at all. If the turbo is bad in anyway can it cause the ecu to say pull timing or screw something else up?? I really think my answer lies in the turbo system, because the engine runs finein nutral were there no boost being built, but as soon as I give it a little it acts up.

thanks to everyone so far, I have talked to a few peole here and there stumped
Derek

 

[gypsysdad]

you should check the shaft play on the turbo if you think that's it. another way to check the turbo is to pull of the ic piping between the turbo and the intake and feel the inside of the piping. if there's oil in there then the seal on your turbo is going. time for a rebuild or new one.

 

[02BLUR]

So it doesn't do it every single time? Like when it is cold can you get out there and rev it up? From my experience if it does it sometimes and then other times it does not, it always seems to be electrical.

 

[1993TalonTsiAWD]

I did check for shaft play and theres none, but a turbo can be bad and still have no shaft play right. And yes I can start it up in the cold or warm weather fine, and it idles fine. I can drive it fine if I shift at 2500-3000, but no boost is being built, thats why I thinkit's a turbo system problem.

Is there any tests I can do to the waste gate,bcs,bov,or any other parts

thanks Derek

PS can someone tell me more how and why spark may be blown oyt before it fires

 

[86MCSS]

Man your all over the place. Concetrate on one thing at a time and eliminate each different factor. If the car is running fine not building boost and then you start building boost and it runs like shit then you more than likely have a big a*ss boost leak. Check all your pressure fittings and make sure they are nice and tight, it would be best to get the entire system pressure tested.

 

[1993TalonTsiAWD]

Man your all over the place. Concetrate on one thing at a time and eliminate each different factor. If the car is running fine not building boost and then you start building boost and it runs like shit then you more than likely have a big a*ss boost leak. Check all your pressure fittings and make sure they are nice and tight, it would be best to get the entire system pressure tested.

thats just it I don't no were to start, I need to knoe in detail the systums of a bad turbo, a bad fuel pump, and a bad MAS. If there are any tests I cand do let me know I'm so overwhelmed that I can't just focus on one thing.

thanks Derek