First drive after rebuild problems

[fourgsixthree33]

My 93 tsi awd has been at a friends garage for about a month where we did the rebuild. Him and i are having issues and i need the car out.

Last week, i drove the car. Idle has been great. Ran smooth and drove easy for a mile. Turned around and wanted to go wot. It bogged down. We got back to the garage and shut her down.

Throttle cable was miss adjusted by a lot. Fixed it, went to start it and it wouldnt start. Hasnt started since the drive. The water temp gauge is always pegged due to eithed a bad sending unit or wire. No matter how we connect the wire, its pegged. Even when grounding out the wire on the manifold.

Tomorrow, im buying both a new sending unit and coolant temp sensor. Btw, we have varified we have fuel and spark. Any ideas?

 

[92AWDHX40]

http://www.dsmtuners.com/forums/articles-miscellaneous/217951-how-diagnose-no-start.html

 

[DSM1G90]

I wouldn't have tried a WOT on a rebuild .. break it in easy ... checked belt timing per chance?

Don't think either sending unit or gauge is bad ... you got an electrical issue somewhere causing the gauge to peg like that ..

 

[Anubis_4_99]

Make sure your timing is correct and your valves aren't bent. Had a similar issue on a build once, timing was off and bent nearly every valve in the head.

 

[dsm44130]

after you adjusted the throttle cable did you make sure the idle stop switch was adjusted to the right spot as well ?

 

[fourgsixthree33]

Used starting fluid last night, she fired right up. Changed turbos ### i had massive shaft play. Warmed the car up, throttle was snappy, sounded great, no leaks. Went down the road, went half throttle, pulled great, then it sounded like it was on 3 cyls. Pushed injector clips on, then it sounded normal. Got back in the car, it stalled. Wouldnt start so i towed it back. Got spark to the wires on all 4, added fuel, wont even attempt to start even with starting fluid. Wtf? Cas? Plugs? Trying both today.

Something is wrong, i just do not know what. Its not mechical, its electrical. Im hoping i am not getting spark at the plugs and only the wires. It was well after 3am when this happened so didnt have time to look too deep into it. But yes, timing is absolutely perfect.

Something is wrong, i just do not know what. Its not mechical, its electrical. Im hoping i am not getting spark at the plugs and only the wires. It was well after 3am when this happened so didnt have time to look too deep into it. But yes, timing is absolutely perfect.

Alright. Last night i swapped plugs, cas, fuel rail, injectors, fpr, put the fps back in, fixed some boost leaks by a proper blt, new coolant temp sensors, injector pack, and some other stuff i am forgetting.

Nothing! I did fix my temp gauge problem but thats it. Plugs are absolutely soaked in fuel so we are thinking we are getting too much. Way too much causing it to make the spark go out.

Compression test was 144 across the board. Getting beautiful spark. Ecu looks beautiful and no leaky caps, obviously fuel isnt an issue ### we are getting a lot of that, and timing is beautiful.

When it runs, it runs flawless. Let it warm up and idle for 10 mins and the instance you hit the gas it dies and wont start back up. Im am getting so pisssed!

 

[fourgsixthree33]

Still have not resolved this issue. Coil pack? O2 sensor? Maf? Fps?

 

[DSM1G90]

Dang...sounds like fuel filter, or weak pump...you get enough up there to run, but it's not giving you enough and you run out...

 

[fourgsixthree33]

If the plugs are soaked (no lie, they are drenched) you would think it is getting enough fuel if not too much? Its as if its in open loop.

 

[bryanwheat]

If it has spark and fuel than it isn't likely a wiring problem. Pull the plugs and let them dry out and retry it.

 

[fourgsixthree33]

I have done that several times by blowing them dry with an air hose as well as installing new plugs.

 

[bryanwheat]

You do for sure have a good coolant temp sensor for the ecu and good wiring right? It will usually flood out like that if the sensor is bad.

 

[fourgsixthree33]

I just replaced both coolant temp sensors with brand new sensors from carquest. The one for the ecu and the other for the gauge. Not the ac sensor. My ac sensor is unplugged and i chopped the plug off almost a year ago.

 

[bryanwheat]

I just replaced both coolant temp sensors with brand new sensors from carquest. The one for the ecu and the other for the gauge. Not the ac sensor. My ac sensor is unplugged and i chopped the plug off almost a year ago.

You might check for continuity to the ecu from the plug for the sensor. Those wires can pretty fragile and break on those all the time.

 

[fourgsixthree33]

Soon as i am done with this 12 hour shift with a 2 hour drive each way is over (supposed to be today) im going ape sh*t with the voltmeter.

The plugs were replaced last year as well with wire crimpers. Old plugs broke as you said, its common.

What about an o2 sensor and maf? Any way to check maf with volt meter?