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Yesterday we did a compression test on the LiteAce, and got 12bar, 12bar, 12.5bar, and 11.5 bar. Sadly it wont start now  All we did was take off the dizzy cap, then take out each plug, check the compression, do each in turn, then put everything back. The spark is hardly there (very faint dark red), but all the ignition parts look okay. Plus its electronic ignition It turns over okay, but wont even try to start So any ideas? Before the compression test it was running okay, but only got 20mpg from a 1500 engine, and it had to use a bit of choke when starting from hot |
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1993 Fiat Panda Selecta
2003 Vauxhall Combo 1.7DI van
2006 Mercedes Kompressor Evolution-S AMG SportCoupé
"You think you hate it now, wait til you drive it"
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Did you put all the leads back on in the correct order? I trust that you would have already checked this, but it's the only obvious thing which might have gone wrong.
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Turning the engine over with no spark plug connected may have banjaxed the ignition system. My first port of call would be a resistance check on the coil.
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1994 Rover Metro
1994 Peugeot 405 Estate
1991 Rover Metro Gti 16v
2001 Fiat Seicento Sporting
1999 Fiat Punto 1.2
1994 Peugeot 106 Xnd (x3)
1991 Westfield 7
2004 Landrover 110 SW
2003 Seat Ibiza 1.9Tdi Sport
1959 Ford 107e Prefect
1992 Suzuki Vitara
2008 Skoda Fabia
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All the leads are numbered so they cant be put back in the wrong position (plus they are shaped with age to only go back on one way). all the leads and dizzy cap were removed together, i thought this would have safe guarded the ignition system |
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1993 Fiat Panda Selecta
2003 Vauxhall Combo 1.7DI van
2006 Mercedes Kompressor Evolution-S AMG SportCoupé
"You think you hate it now, wait til you drive it"
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checked all the fuses, and now the radio works ;D
(granted, only when it wants to, and sometimes every digit on the radio comes on at the same time)
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1993 Fiat Panda Selecta
2003 Vauxhall Combo 1.7DI van
2006 Mercedes Kompressor Evolution-S AMG SportCoupé
"You think you hate it now, wait til you drive it"
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bortaf
Posted a lot
Posts: 4,549
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could have blown the dizzy i allways unplg leccy dizzys mind you thats cos on the efi pinto they drop at the slightest over crank so might not be an issue with the liteace ?
check the carbo cetre electrode hasn't popped out the cap.
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R.I.P photobucket
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the cap was taken off with the leads
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1993 Fiat Panda Selecta
2003 Vauxhall Combo 1.7DI van
2006 Mercedes Kompressor Evolution-S AMG SportCoupé
"You think you hate it now, wait til you drive it"
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bortaf
Posted a lot
Posts: 4,549
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the cap was taken off with the leads yeh you said have you checked the carbon contact then ? |
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R.I.P photobucket
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Sorry didnt realise what you meant. Yeah its still there  |
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1993 Fiat Panda Selecta
2003 Vauxhall Combo 1.7DI van
2006 Mercedes Kompressor Evolution-S AMG SportCoupé
"You think you hate it now, wait til you drive it"
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oldchap
Part of things
just hanging about
Posts: 202
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the king lead from coil to the dizzy has probably broken inside when you took the cap off
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what's that awful noise
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Well we have ordered a new set of leads (all five of them) and a new dizzy from Toyota, so will see if that fixes it, but one guy thinks it might be the coil (hence low mpg too).
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1993 Fiat Panda Selecta
2003 Vauxhall Combo 1.7DI van
2006 Mercedes Kompressor Evolution-S AMG SportCoupé
"You think you hate it now, wait til you drive it"
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Usually a bad coil will also give bad driveability when hot (stuttering etc.) But since you said it needed some choke when hot it might just be worn and isn't outputting what it should (hence the red spark). It failing now, right after a compression test, might just be a darned coincidence.
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I think Bortaf meant diconnecting the low-tension side of the dizzy circuitry - it's possible to blow up the electronic ignition modules by turning the engine over if there's nowhere for the spark to go, since the coil from producs a lot more volts than normal which can destroy the transistors.
If I can't be bothered to disconnect the dizzy, I tend to connect a single plug to the coil with a plug lead and let it earth. Could also be the coil I suppose - worth a try.
Did you have a look at the spark before doing the compression test? If it's small and red or yellow it probably won't run.
TBH, I would've suggested looking at the ignition timing if it's thirsty (could be ignition or running rich) and requires choke when hot (running rich won't need choke when hot) - sounds like it's retarded by a few degrees to me. Is the exhaust stock and in good nick? Low back pressure can cause an odd combination of thirstyness and running lean at idle.
Finally - a 1500 in a large-ish van like a LiteAce will never be very economical, since it will have to work hard. 20 does sound a bit on the thirsty side though.
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bortaf
Posted a lot
Posts: 4,549
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I think Bortaf meant diconnecting the low-tension side of the dizzy circuitry - it's possible to blow up the electronic ignition modules by turning the engine over if there's nowhere for the spark to go, since the coil from producs a lot more volts than normal which can destroy the transistors. If I can't be bothered to disconnect the dizzy, I tend to connect a single plug to the coil with a plug lead and let it earth. Could also be the coil I suppose - worth a try. Did you have a look at the spark before doing the compression test? If it's small and red or yellow it probably won't run. TBH, I would've suggested looking at the ignition timing if it's thirsty (could be ignition or running rich) and requires choke when hot (running rich won't need choke when hot) - sounds like it's retarded by a few degrees to me. Is the exhaust stock and in good nick? Low back pressure can cause an odd combination of thirstyness and running lean at idle. Finally - a 1500 in a large-ish van like a LiteAce will never be very economical, since it will have to work hard. 20 does sound a bit on the thirsty side though. Yes i did, sorry i didn't make it very clear  an 1800 in a spacecruiser will do about that mpg, larger engine in a heavyer motor and all that ?? come to think of it both my 1800 and 2000 spacecrusers, the 2.4 previa and my 2.2 TD lucida all do 22 max round town though that last 2 are auto, on a run they all did/do in the mid 30's, round town weight and having to get that mass moving plays a big role in fuel condumption ? is it the dizzy with the coil built in or a seprate type normal coil ? sorry not worked on a 1500 for over a decade  |
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R.I.P photobucket
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one small point - if the coil was on the way out, at wider throttle openings, it would have misfired
low power coil = lower output voltage
more throttle = more air to compress
more air = higher resistance for the spark to jump
So at light throttle openings, it would be fine, anything more would see it misfire. It would either ignite, or it wouldn't - there's no halway point tbh
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You're like a crazy backyard genius! |
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