problem is it breaks up real bad at 3k

[92TsiTurboTalon]

Hello everyone, this is my first thread ever on a dsm forum, so ill try my best. i have some very nerv wrecking problems with my tsi talon. Its a 92 eagle talon tsi fwd with a BOV ,no cat, i think i fatter down pipe, new ngk cold plugs, and thats it i believe. The problem is it breaks up real bad at 3k like its on a limiter. it supposedly ran fine before some guys soaked the engine bay while cleaning it. after that the sputtering began. i unplugged the maf and it ran alot better. it revved up and was actually drivable. So i figured it was a bad maf. i bought a new one a plugged it up and still the same problem, i even bought a new TPS. still nothing. so i put ngk cold plugs gapped at .28 and it runs a little better, but still breaks up real bad with the maf hooked up. i doubt that its a boost leak, and i doubt the maf is bad again. maybe it needs a new idle air controller? but i think its running too rich with the maf connected. its getting good fuel to the manifold. and im sure the injectors are fine. is there anything that could have got wet or just went bad to make it sputter witth the maf connected? sometimes it will do the "rev limiter thing" then rev up a little with the maf connected but its really bad. like i said it runs ok with he maf disconnected but still breaks up on the top end. and i know that running no maf cannot be good. i dont want to spend alot of money on this thing so a gm maf is out of the question. any clues or ideas guys?
thanks ROB.

 

[97GSXmitsy]

test or replace your coil packs and power transistor. or do one at a time and see which one fixes it. make sure your injector clips are plugged in all the way on to the injector. also try obtaining a second gen mass air. those first gen mass's are figgity sometimes. pop the cover off of your ecu and see if it smells like fish. those ecu's are funny also. they can work one minute and then take a shit on you the next. give those a try and let us know.

 

[92TsiTurboTalon]

thanks mitsy, the spark plugs are definatly getting spark, but i have had one foul out on me before. probably from too much fuel. but i will definatly check those things. it has to be something that is affected when i hook up the maf. thanks.

 

[tbonitz301]

boost leaks. It is very easy to test for them, and should be one of the first things you do to troubleshoot a problem of this nature

 

[92awddsm]

bad plug wires or caps leaking in ecu. At this point you are clueless so dont overlook any suggestions.

 

[92TsiTurboTalon]

im very clueless, first dsm, and i heard theyre hard to maintain. do you think i should get all new tubing with an intercooler? thanks.

 

[redline2k6]

just like some one has stated earlier do a boost leak test if your running rich its a good place to start

 

[9 T GSX]

When you say cold ngk,did you put in a step colder plug? how much colder? First thing to do is blow out all electrical connectors injectors,cas sensor,maf and blow them out.Also might want to blow out the alternator,also might want to have it tested to see if its putting out the proper voltage. What kind of plug wires you have? try changing them,I'd recommend factory ones or ngk's all the rest are just crap.

 

[92TsiTurboTalon]

i beleiev the plugs are ngkbre6? i tried regular ngks, and it was still the same. the plug wires are after market but they give great spark to the plugs on all 4 cylinders. so im geussing the coils, and wires are ok? im just confused as why it runs like dog crap with the maf connected? and alot better without it? im trying to cancel out problems that would not be affected by the maf, because it seems to "have to do something with the maf since when i unbplug it it totally changes the attitude of the engine.would a boost leak only occur with the maf on? because it makes alot of boost without it connected. thanks guys
ROB.

 

[99RedGs]

Is your BOV recirculated?

 

[super97gst]

Since this problem supposedly came about after washing the engine bay, you might consider testing the CAS (cam angle sensor). Usually the CAS is the first thing to go out after getting wet.

 

[92TsiTurboTalon]

i am really not sure if my bov is recirculated. all i know is its on the tube coming from the intake, and goes down thw front corner i believe to the intercooler? it blows off really loud when the maf is disconnected. cam angle sensor sounds like a good hit also. i think i should try to find one of those on ebay and hook it up. thanks guys for all the input please keep it coming!

 

[TjPhillips36]

Take a picture of your engine bay. Their should be a line coming of your BOV going to your intake (before the turbo, right after the MAF).

 

[AlaskanDsm]

I am having issues with my car that I didn't believe would be related to a boost leak but as soon as I did the test I found probable solution to the problem I am having. So I would recommend doing a BLT regardless if you think its not causing your problem. The tester is cheap to build and its easy to do!! You might get surprised at the results.

If the CAS goes out, I thought that the car wouldn't start. I know if its unplugged it won't. I'm just asking because I don't know.

 

[Krazy_Kreationz]

x2 on the BLT I had a friend come over just a little while back with the same issur as yours and did a boost leak test. ended up being a leak around one of his IC pipes...

 

[Defiant]

Take out those "cold" plugs, get a set of NGK BPR6ES, gap them to .028" and see if that fixes it. If not, get a new set of plug wires.

 

[97GSXmitsy]

there is also the possibility that your mass air is completely dead. when i still ran a mass i had two completely die on me. make sure none of the pins are bent or broken off on the plug. and like everyone else is saying. boost leak test it. if you dont know how....

http://www.vfaq.com/index-main.html

click on intake and then scroll down to intake leak tester and click on that. Also make sure the previous owner didnt rip out all of the honeycombs in the mass air. As far as the blow off valve recirculating, there should be a rubber tube about 1in in diameter going from the outlet of the blow off valve to the intake pipe right before the turbo. If that tube is not connected like stated then that is a big part of your problem and if it is then its time to start looking in other places.