GolfGTIforum.co.uk
Model specific boards => Golf mk2 => Topic started by: Ben Lessani on 12 December 2008, 23:18
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:sad: is the only way to describe how I feel.
If you're not familiar, I didn't have antifreeze and everything froze up. I've replaced the metal pipe, changed the radiator, charged the battery and bought and fitted a new starter motor....and I go to turn her over and ... NOTHING!
Here's what I know,
- The fuel pump is priming and the pressure is ok
- Compression is even 12bar across all 4 cyl
- Spark plugs are clean and there is a strong spark
I had gotten it to run once, but it wouldn't idle, it only kept going if you kept it on mild throttle.
The rest of the time when you crank it, after about 6/7 seconds theres a loud bang from the exhaust - almost like a backfire, but the exhaust is cold.
Interestingly when I took one of the spark plugs out to test the spark, it did bang and there was a light smoke coming out the spark plug hole.
The car has been sat stationary for almost 5 weeks - and I believe the valve stem seals leak, so its likely the cyl were full of oil? And I can only guess the bang was hot carbon deposits igniting fuel from a flooded engine?
The only thing I can think is that the timing could possibly be out from ice expansion - but its a long shot. What's going on!
Edit More googling has revealed it could be a vacuum leak, or moisture in the dizzy - so I'll check those in the morning.
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have you touched the plug leads ?
if have wind the neinge round so the timeing marks line up and look see which plug lead the rotor arm is pointing at. form the sound of it leads are 180 deg out
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The leads have only ever been removed 1 by 1.
"wind the neinge round" ??
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Phff. It could be a hundred things as you know, but is it worth checking that everything regarding the air intake is done up right. Might be something really simple like that is all. :smiley:
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I know! This is a real kick in the balls when I'm so close to be able to drive the car again.
I'll go over all the vacuum hoses and the intake and check its all done up ok. I had removed the airbox > throttle body pipe to spray some cold start in when testing for a spark the other day - I might have not got the rubber boot on properly on the underside, so I'll check that tommorow too.
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It's worth checking, i found out recently. A little thing like that can make all the difference. :smiley:
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Has the cam belt slipped due to the water pump being frozen up? (Can't even remember if the cam belt drives the water pump TBH. Long time since I've been in that area. :undecided:)
This happened on my brothers car a few years back. Coughing and spluttering with wisps of smoke but no start.
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It sounds like your getting a spark and fuel, so I would go with air leak or timing as the culprit.
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Has the cam belt slipped due to the water pump being frozen up? (Can't even remember if the cam belt drives the water pump
The water pump is on an aux belt, so it seems unlikely. But it does remind me of my mums car when I did the HG - exact same thing, turned out to be the coil pack on hers...
It sounds like your getting a spark and fuel, so I would go with air leak or timing as the culprit.
It looks that way. Its p***ing it down right now so I can't play, especially since I still need to see if the water is leaking anywhere else.
Edit This site (http://www.benzworld.org/forums/w116-s-se-sel-sd-class/1223523-bosch-d-jetronic-k-jetronic-troubleshooting.html) says
Backfire in intake
1)Check that CO adjustment is correct;
If incorrect,backfire will result if started and under a load.
2)Boot between airflow sensor and throttle defective;
Will result in a lean mixture due to secondary air(false air)
3)Vacumm leaks;
Self explainatory.
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might be worth checking for broken wires especially as youve been working in the engine bay. check the one that plugs into the dizzy too, i know on the 16v these become very brittle and brake. :smiley:
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Interesting point ... I did break 2 wires, one which goes into the warm up valve and the oil cooler sensor - but I soldered and recrimped as appropriate. Continuity testing the loom wiring is going to be a pig though :(
So for my checklist:
Check for broken wires / loose cables
Check for vacuum leak / loose intake pipe
Moisture in the dizzy
Position of the rotor arm at TDC Cyl 1
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Had a similar problem on a mates kjet. Was parked up for weeks.
Broken dizzy wires are common. give the plug a wiggle.
Blue temp sensor?
We got it to idle by adjusting the dizzy (mark it first). Once it was running we put it back to the original position. Wierd these vw's :rolleyes:
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I checked and re-positioned the intake pipe, unplugged and replugged all the electrical contacts I had removed. Removed the dizzy cap and cleaned up the contacts then soaked it in WD40. Reseated the battery clamps and prayed to all the popular deities ...
... turned the key, and low and behold, SHE FIRED UP! She seems to run ok without any issues :grin:
There was a small leak from the water pump; I did remove it yesterday to check the impeller was ok. But I drove it to GSF to get a new seal, but by the time I got there, the leak had stopped. I drove round a load more and let it run on the driveway for 5 mins, but no leaky - so maybe the rubber seal needed to reseat itself....But I'll keep an eye on it.
After driving it for 5 minutes though - it was totally worth putting in a few hours labour :cool:
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Good news !!
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Glad you got it sorted!