GolfGTIforum.co.uk
Model specific boards => Golf mk3 => Topic started by: sharki786 on 11 October 2013, 14:55
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My mk3 8v gti (agg engone code) is refusing to start again in the cold mornings. It cranks fine and keeps cranking for ages till the oil light flashes (wont fire up or start at all). Did it today at 2pm (not long ago) today morning i got in car at 5.30am and it just kept cranking didnt fire up (kept cranking for 5-10 seconds, no luck tried again then fired up after a good few seconds. Its been parked up all morning. I went to the car at 2pm and tried to start it but same again (cranked for 10 secs, no luck, tried again, no luck then tried again and it fired up straight away.
In the summer it fires up as soon as you turn the key. Battery is fine btw
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Lazy Starter?
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temp sensor is worth checking
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Temp sensor is very likely. I had an 1.8 GL back in the day with the same problem and it turned out it was the coil. It had spark but it was very very weak. It always eventually started and never cut out on me.
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Its pi$$ed of at your mk4 getting all the love :grin:
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beat me to it screech lol... :grin:
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Its pi$$ed of at your mk4 getting all the love :grin:
Hahaha damn right after the amount i have spent on the mk4 and its not even on the road yet. Lolsss
Dont think its a lazy starter as in summer it started on the 1st turn of key.
Coil is a few months old aswel.
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Anyone? Only happens in the cold. Never messed ne about in the summer mornings. Just last week when it was cold
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coil, temp sensor, iffy hall sender wires (although this should throw a code up).
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Will check for codes when i get a chance. Coil is a few months old. Il check the temp and hall sensor. Thanks
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Lazy Starter?
Seems like you was right. As i went to start the car yesterday and same again refused to start so finally after the 3rd crank it fired but but the starter was making a right racket so i will be going into the garage tomz and get it changed over.
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Issue still here. New starter fitted and still doing the same. Changed battery from the mk4, kept the car running while i removed the battery, it didnt cut out so i know the alternator is banging the right voltage out. Where is the temp sensor located? Is it on top of the coolant hose in the middle of the engine?
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. Where is the temp sensor located? Is it on top of the coolant hose in the middle of the engine?
yep and it just push fits (and pulls out to remove), just make sure you get the correct colour (there's a ring around the base) and a new sealing ring
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. Where is the temp sensor located? Is it on top of the coolant hose in the middle of the engine?
yep and it just push fits (and pulls out to remove), just make sure you get the correct colour (there's a ring around the base) and a new sealing ring
Doea this send a temp reading to the ecu or the clocks? If non of them then whats it used for? Going to get one from mad4vw's
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temp sensor does both jobs...... ecu and gauge!
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It's called ECU temp sensor, so I would have thought it goes to the ecu. Unplug it and try to start, see if it makes a difference. Give your starter direct power, see if it cranks first time.
I'm starting to think it could be an earth issue.
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temp sensor does both jobs...... ecu and gauge!
So you think its sending wrong readings to ecu?
Another thing i forgot to mention is that today morning i noticed my brake lights were on but no1 touching the brake pedal they wernt on full power just dimmed. I replaced all my rear lights with led (normal bulbs in the indicators) anyway i removed 1 brake light led and they went off replaced with normal bulbs and its all good. But car still struggles to start. Will be going to get the temp sender today.
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It's called ECU temp sensor, so I would have thought it goes to the ecu. Unplug it and try to start, see if it makes a difference. Give your starter direct power, see if it cranks first time.
I'm starting to think it could be an earth issue.
Unplugged the ecu temp sender still the same
Sometimes it sounds like theres enought power to crank the engine and next min its like the battry on its last legs or when i 1start it the battry sounds like its nearly dead then if i try again all of a sudden the battry has full power. This battery was running fine in my mk4 till the car was stood then it died so yesterday i swapped battry while the car was started so it should have charged the battery
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So little update. Replaced the new starter, still same, bought brand new battery (yuasa 550cca) still same. Last night the car refused to start i had to get a jump start and car started. Checked for faults on vagcom no faults. Checked crank sensor and wires are bare, used some tape and taped them up, still same. So i checked relays and relay 30 is very hot after the car has been running. Mad4vws will bring some over later and i will check to see if it is that.
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Little update. Got relay 30 from mad4vws and tried it still same. Both relays get hot after 10mins of car started. Will look at a new crank sensor
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I think its either an earth issue or get the engine compression checked.
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See the funny thing is, the car has never cut off (unless i stall it like a spaz) :grin:
Im going to have a look at the earth toms. Got a 90amp alternator, will bang that on & will buy a new crank sensor as the old one is quiet bad but i have taped the naked wires up.
Will also replace the a hose going from the intake to the brake servo bob thing lol
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check timing on dizzy. my passat had the same problem...it was the dizzy timing..
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check timing on dizzy. my passat had the same problem...it was the dizzy timing..
I would expect it to have a 5000rpm limit if timing was out (then again how many mk3 owners go near there?)
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check timing on dizzy. my passat had the same problem...it was the dizzy timing..
I would expect it to have a 5000rpm limit if timing was out (then again how many mk3 owners go near there?)
My dizzy was shot on my 2E, really bad lagging problems up to 3k, arm had about an inch of play and was causing a hard, rough cold start, misfire, overfuel ect. New dizzy improved the problem but the timing was way off (and there was no mark on the flywheel to use a timing light either). Anyway long story short, never had the 5k problem so assumed the timing was fine... timed it by hand using trial and error, rotating the dizzy - it fixed a multitude of problems.
I assume you have bought a genuine temp senor as well, the ones from GSF caused more problems on mine than they did good. Hope you fix it, I spent a good 3 months this year pulling my hair out over a similar problem.
edit: also if you buy a new/used dizzy, just be careful it matches the one in your car as the differing ECUs set the timing differently. There are two different types. One has one slot cut in the casing so it sets the timing from the first contact only, the one I needed had 4 so it keeps track the whole way round - right pain in the ass.
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Once the car is running there is no rev limiter problem the engine picks it speed up just the way it ment to. The coolant temp sender is working fine (i disconnected it and the temp needle didnt move from the cold line). I replaced the brake cylinder hose from inlet as the old one was broken and hissing after i turned the car off. I also cleaned the throttle body today as its not been cleaned for over 2 years but i aint done near 3k miles per year (so was pretty clean). Getting a crank sensor toms as my old one has the wires exposed and as a temp fix i have taped each wire up. Also my unc said it might be earth wire as golf mk3 gti has said. So i will replace crank and alternator and then earth wires.
Could someone tell me were all the earth wires are?
The main earth goes from battery to starter
1 on the gearbox
1 to the coil pack from side of the head
1 ment to connect to the bonnet but that broke of years ago lol
Which have a missed?
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There's earth wires under the battery tray. That's all there.
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There's earth wires under the battery tray. That's all there.
Cool. Il check them out then. Only thing i hate is that im going to loose all the settings on my headunit unless i write them down lol.
Well car started fine today morning did take a second but nowere near as bad as it was yesterday. I looked at the temp on the trip computer and it was 9'c. Yesterday i had to give it 3 long cranks (dont want to burn the starter out as its brand new)
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Ok another thing i forgot to mention lol. Once the car has been started and if i turn it off and start it within 1min it will start but after 5mins (water temp half way) it will take 2 cranks
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Give a check of any engine codes. Also could be condensation buildup in the earlh mornings on some components. Found with the celica i owned that spraying a bit of wd40 on the spark plugs and HT lead connectors either end made a big difference on starting up even when left for a few days in the cold.
Edit: forget what i said, i keep forgetting its possible for a thread to be on more than one page.
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Give a check of any engine codes. Also could be condensation buildup in the earlh mornings on some components. Found with the celica i owned that spraying a bit of wd40 on the spark plugs and HT lead connectors either end made a big difference on starting up even when left for a few days in the cold.
Edit: forget what i said, i keep forgetting its possible for a thread to be on more than one page.
Checked for codes on weedend. Nothing comming up apart from abs rear right. I got my new crank sensor just need to fit it and will give it an oio change with filter. As other stuff is newish
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Small update. I had the crank sensor fitted and also changed the oil and oil filter on thursday. Andyway yesterday after driving about and being stuck in traffic with my son i dropped him off home and headed of to the garage. I got onto a strech and decided to out my foot down to over take BANG BANG misfire and a huge sudden drop in power which sent me flying forward (always wear my belt) managed to get it started and it wasnt idling or running, it stalled then after a few seconds it was fine but as soon as i put my foot down it would misfire and die. Eventualy i managed to get it to the garage and it was fine WHAT A CNUT! Why did the problem go away? I left it started for ages took it around the block a few times but it wouldnt misfire or cut out. Drop it home fine (under 2k revs) lol
The misfire/backfire sounded awesome in the tunnel as it normaly does :cool:
Spoke with the mot guy and he says that it could have been some water on some elec comp. My unc says its the crank sensor that could be fauly?
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I went through what I thought was a small puddle and the water must have flicked up and covered the dizzy area, misfired for a few mins then went away never to come back so the MOT guy was correct in saying that.
What brand crank sensor did you get? Siemens VDO from ECP was the exact same as the one i removed from my car so could be the original (provided it wasn't replaced already) but 4 years later its still going ok touch wood. Have fitted Meyle, GSF cheap items and had them come back a week later.
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The misfire was pretty violent as it threw me forward (my lower back hurts lol) time for whiplash claim i thinks lol.
Wel i got the part from central auto supplies and the part they gave me was interpart so i rang them yesterday and explainedto them. They will ring the supplier up on monday to get more into on the part.
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How can i check to see if the crank sensor is reading? Is there anyway from vagcom?