British Columbia DSM
GVRD - BC DSM Club => Garage => Topic started by: Nathan Craft on March 12, 2011, 08:24:58 am
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mine's pooched,no spark for cyl. 2&3. if anyone's parting out or has a spare that'd be great.
thanks,
Nate
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Sounds more like your power transistor. those are the 2 cylinders effected if the transistor fails. try that first.
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I agree, try that.
The transistor packs can fail but the coil packs are pretty robust.
Also it could be the ECU as well.
Oh and just to be technically correct, make sure you test your wires and plugs. IE, run the 1and 4 wires off terminals 2 and 3 and see if they spark. And try the plugs in the same way.
Also look at the plug in connectors for the coil pack and power transitor too as if they are green and corroded theres your problem.
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I agree, try that.
The transistor packs can fail but the coil packs are pretty robust.
Also it could be the ECU as well.
Oh and just to be technically correct, make sure you test your wires and plugs. IE, run the 1and 4 wires off terminals 2 and 3 and see if they spark. And try the plugs in the same way.
Also look at the plug in connectors for the coil pack and power transitor too as if they are green and corroded theres your problem.
any idea if you guys have a pic of that?
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a pic of what? My quoted text deals with a number of items. :)
if you are referring to the corrosion in a connector, it will be really obvious. Unplug the device and look at the terminal pins inside the connector both on the part and the wiring harness end. If the pins are clean and shiny, they are fine. If they are rusty, dirty, corroded, green etc, they need to be cleaned up individually and then the terminal blown out with air and then some anti-rust spray squirted in the terminal. WD40 works.
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lol Sorry was in a bit of a rush ::) Should have been more detailed. The transistor pack, just to see what unit that is. I dont have my shop manual downloaded to my work comp. yet, so I really cant say. but i'll go swap out the wires for 1-4 & 2-3.
The weird this is that it will run normally for a minute or two, then crap out on me. so I'm kinda hoping that is is just a bad connection.
thanks again guys
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Its a 2 bolt black connector that has 5-7 pins and its located close to the coil packs. google 1g dsm power transistor. tons of pics and write ups.
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Checked the transistor pack, everything seems good there. But while I was rootin in there I noticed a small plug with three wires just above the transistor, and one of the wires is hangin on with a single strand. When I disconnect said plug, the engine just dies. But fiddling with it and trying to get a decent connection seems to shortly fix the issue. I'm going in on my day off tomorrow to fix the wire regardless, but I have to pull the fuel rail to do so properly, could this connection be my issue? And what plug is that for? Again it is just above the transistor, and runs under the fuel ral somewhere.
Thanks
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Ide be willing to go out on a limb and say that is your problem. If the wire has anything to do with power to coils or transistor it will definitely effect the way it runs. If the voltage is pulsating through a weak connection than it will effect your spark greatly.
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Well I guess I'll find out tomorrow. I've been trying to figure this out for almost a month of and on. if it turns out that it's just a single wire, I'm gunna be pissed. Happy it's an easy fix, but pissed.
Also mods, can this thread be moved to the garage? Don't want to be a bother, but it would make more use over there :)
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that 3 wire plug is for the coil pack, so yea, that will be the culprit.
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yeah... three wires on the coil pack... theres one ground... and the other two controll each coil pack. One fires 1&4 and another fires 2&3.. if one of those wire is barely holding on and making a intermitant connection it will definalty cause problems.
The connector will be a triangle shape for a 91-94 and on a 1990 (which u dont have) it will be a 4 wire square plug.
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So I have the coil pack pulled off. only have one thing to say.. CAN THEY MAKE IT ANY HARDER TO GET TOO?!? lol but really it's dumb. the wire is now disconnected due to pulling on it, and just waiting on the wreckers to call me back and tell me if they can get another harness plug down to me here. if not i'll just make my own harness.
i'll be adding pics when i get home. :)
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you can probably cut a harness off another car and solder/shrink wrap those connections, just make em good and strong.
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well, fixed the harness up, but still no spark, ordered new plug wires. see if that helps.. if not, i guess next step would be the coil pack... getting kinda stumped here..
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If the transistor module was bad, you'd have more missfires than 1 cylinder.
The Coil Pack could be faulty.
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Well, tossed in the new plug wires, wham bam thank you ma'am 8) lol. she's running good sofar. still idles a little high for my liking, but i'll live with it for a day or so. took a D-plate out and god i miss boost ;D. next up is the head-gasket and timing belt.. that i'm not looking forward too, but all in time ;)
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well.. for some reason the issue is back.. but when I disconnect the battery and basically reset the ECU, the issue goes away for a bit and then comes back.. any ideas?
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Ecu??? Did u try a diff one?
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i'm starting to think that might be the case.. i need to get this thing figured out, but dont know if anyone is close enough to let me borrow one. and really cant afford to just buy one right now. I have to move to kelowna at the end of the month and i may just end up leaving the tsi here..
but i'll see what i can find
**update**
looked at the ecu again.. Nothing wrong.. Also took a test light to the coil signal wire, getting a good signal, so I'm going to re-wire the coil and swap the coils to see if I can rule out a bad coil.. I think that's my issue
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anyone in kelowna have a coil pack i can buy off them real cheap for a 91 Tsi? will be there all weekend. or if anyone knows a pick and pull that has one. ty!
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Cam Angle Sensor too
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How would I go about testing my transistor pack and cas? And I thought that if ur cas goes, you hve total loss of spark?
we basically just totally ruled out the coils being bad. we swaped leads/wires. and we used a test light to moniter signal. there is proper pulse with 1/4 but 2/3 was constant.. but as we had the test light on ir randomly came back on and started running properly.. so we (myself and our hybrid tech) are thinking brett's right. ECU. he said it wouldn't be the transistor because it IS intermittent. either a faulty wire or ecu.
any ideas?
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no. If your CAS goes, you may not have total loss of spark. You cant really test the CAS. You just have to try with a known god one.
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that's kinda brutal.. might as well try and find one i guess..
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same shit happened to me and after swapping the coil pack, spark plugs, wires, power transistor, swapping the ERCU and checking the fuel pressure and compression, it was the CAS all along.
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I had a CAS issue once, and I was successfully able to repair it.
Take it off the car(mark where it goes), and then when its out mark where the moving parts that interface with the intake cam go so you can put it back correctly.
Then, with some needle nose vice grips or something similar, unscrew the cover. The screws are one way only by design, but you can get them out.
Then look inside, you will see an optical switch. There is a ring with square holes in it, and a small part with a wee little lense. The lense sends light out and when its blocked by the metal ring, it can't get that signal thru. When its not blocked(a hole is there), the light beam can get back across to the other side of the sensor.
Mine was just dirty and cruddy. I cleaned it with brake cleans, a toothbrush and some care. Then I put it back togeather. All has been well for about 5 years now.
Its definately worth a try, as if you are going to swap it you have to pull it anyways.
Oh, put the engine to TDC, then the marks on the CAS(internally) will already be lined up and you won't have to make new ones.
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pulled the cas.. holy it's dirty, and the little blue band kinda just fell off.. so needless to say i'm pullin a blacktop CAS from the looks of things. still wouldn't mind getting a hold of a working ECU tho..
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you should clean it up and try to open it. If its cruddy in there, and the light lense thing is obstructed, you may have found your fix.
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will do when i get back into town, shop closes early on sat, and i'm headed to kelowna tonight for two days, so i'll try to hit up a pick and pull, see whati can find real cheap, but regardless yea i kinda wanna do it, clean it up, just to see :)
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well pulled the CAS out, marked things as i pulled it all out, cleaned everything up (minor grease in there) and put it all back together.. now i have a no start.. any ideas? i'm starting to thing i messed things up lining everything together but i cant seem to find how to set TDC.
any ideas tips please?
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probably was on its way out.... and cleaning it finished it off.
Try a new CAS.
if should still start even 180* out.... but u can try turbing the key 180*... but i doubt thats it..
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will do. as soon as i can find someone parting out or has one for sale real cheap sometime around the end of april i'll snag it and see if i cant get it going. i'm not in a huge rush anymore, left the Tsi at my mothers in castlegar and just bought an old 91 cutlass to drive for now.
so if anyone's got a 91 CAS for sale lemmi know lol