1.8T Still not starting - Page 2

Gary · 20th October 2009, 19:47

Quote:

Originally Posted by pab

one hell of a missfire..
have you tried a slow tow start,maybe in third?worth a try

I haven’t but there is no sign of live in the engine what so ever. It’s a bit of a strange one this.

Ratdogfink · 20th October 2009, 20:01

Quote:

Originally Posted by Gary

I would say the engine is turning over normal – The cam belt is intact and I have checked the compressions they are all about 75 psi. There was a violent bout of misfiring so much so that it blew the breather pipe off the cam cover. Is it possible that the cam belt jumped a tooth?

Don't start dragging it around to make it do it. If it will start it will with the key. Now more information. I had about 10 bar on each of my cylinders today (0 on one). Thats 14.5 pound to the bar I had 150 PSI, you had 75 PSI. Check belt timing and make sure its got all it's teeth.

Gary · 20th October 2009, 20:33

Quote:

Originally Posted by Ratdogfink

Don't start dragging it around to make it do it. If it will start it will with the key. Now more information. I had about 10 bar on each of my cylinders today (0 on one). Thats 14.5 pound to the bar I had 150 PSI, you had 75 PSI. Check belt timing and make sure its got all it's teeth.

The battery is low so I wouldn’t expect them to be very high but the main thing is I have compression and they are all the same. There was one hell of a bout of misfiring and the old car shook so it may be that the belt has jumped a tooth which would explain low compressions the los of power after the misfire and why it doesn’t start now. There is obviously no damage to the valves because I still have compression. I don’t know how far out on these engines the cam timing has to be before the piston hits the valve. A job for tomorrow I do think.

klickmarket · 20th October 2009, 21:58

gary,

ignition system is all that is left if mechanicals, and fuel are o.k.

Duff coil would do what youre talking about.

i had a coil go on me before, and it did what yours is doing.

replacement coil fixed that one...

klickster

Gary · 21st October 2009, 08:48

There is a good healthy spark at the plugs so I think probably the coil packs are okay.

T-Cut · 21st October 2009, 11:28

Long shot, but that seems to be where we are on this - the cooling system hasn't been mentioned so far. Is this normal or could you have a leak into the inlet manifold? The sudden misfiring event doesn't sound to me like a slipped cam belt. It seems more likely to be an instantaneous failure of something involved with combustion. If there's fuel, oxygen and a spark, it should ignite. The one thing that might stop that is water.

TC

klickmarket · 21st October 2009, 12:27

gary

any chance your engine is flooding ,...would account for The sudden misfiring event.

too much fuel would soak the plugs, but eventually give you the big bang.

let us know how you sort this eh ??

klickster

Gary · 21st October 2009, 13:02

I have been a long time out of the trade and the technology of the modern car engine has left me behind but I should be able to get it going. Like you say it has fuel spark and compression so something should happen but it does nothing, not even a splutter. My thinking at the moment is when it started to misfire (which was violent by any standards – it blew the breather pipe of the cam cover). I know it’s a long shot – but if one of the cams jumped a tooth that would explain the loss of power after the misfire and why it won’t start now –Well maybe?????

T-Cut · 21st October 2009, 13:07

And why did the crankcase pressurise to that extent? I'm now thinking about pistons, rings and such. You only saw 75 psi compression after all. A low battery can't affect that.

TC

Gary · 21st October 2009, 13:43

Okay but I think it is unlikely that the rings would go at the same time on all four pistons…………….one piston maybe, but then compression would be significantly lower on one and they are all the same. If the valve timing was out – say the exhaust opening early or inlet closing late then the compression would be down. Even with 75 PSI I would have thought it would have the occasional cough or something. There is no water loss by the way.

20th October 2009, 21:58	#14
klickmarket Regular poster R75 saloon Omega 2.2 + No Tourer Join Date: Mar 2008 Location: Central Scotland FK7 Posts: 57 Thanks: 1 Thanked 0 Times in 0 Posts	gary, ignition system is all that is left if mechanicals, and fuel are o.k. Duff coil would do what youre talking about. i had a coil go on me before, and it did what yours is doing. replacement coil fixed that one... klickster

21st October 2009, 08:48	#15
Gary Avid contributor Rover 75 1.8T Club - Mitsubishi GTO Join Date: Apr 2009 Location: Weymouth Posts: 107 Thanks: 0 Thanked 0 Times in 0 Posts	There is a good healthy spark at the plugs so I think probably the coil packs are okay.

21st October 2009, 11:28	#16
T-Cut This is my second home Rover75 and Mreg Corsa. Join Date: Nov 2006 Location: Sumweer onat mote o'dust (Sagin) Posts: 21,753 Thanks: 341 Thanked 3,660 Times in 2,924 Posts	Long shot, but that seems to be where we are on this - the cooling system hasn't been mentioned so far. Is this normal or could you have a leak into the inlet manifold? The sudden misfiring event doesn't sound to me like a slipped cam belt. It seems more likely to be an instantaneous failure of something involved with combustion. If there's fuel, oxygen and a spark, it should ignite. The one thing that might stop that is water. TC

21st October 2009, 12:27	#17
klickmarket Regular poster R75 saloon Omega 2.2 + No Tourer Join Date: Mar 2008 Location: Central Scotland FK7 Posts: 57 Thanks: 1 Thanked 0 Times in 0 Posts	gary any chance your engine is flooding ,...would account for The sudden misfiring event. too much fuel would soak the plugs, but eventually give you the big bang. let us know how you sort this eh ?? klickster

21st October 2009, 13:02	#18
Gary Avid contributor Rover 75 1.8T Club - Mitsubishi GTO Join Date: Apr 2009 Location: Weymouth Posts: 107 Thanks: 0 Thanked 0 Times in 0 Posts	I have been a long time out of the trade and the technology of the modern car engine has left me behind but I should be able to get it going. Like you say it has fuel spark and compression so something should happen but it does nothing, not even a splutter. My thinking at the moment is when it started to misfire (which was violent by any standards – it blew the breather pipe of the cam cover). I know it’s a long shot – but if one of the cams jumped a tooth that would explain the loss of power after the misfire and why it won’t start now –Well maybe?????

21st October 2009, 13:07	#19
T-Cut This is my second home Rover75 and Mreg Corsa. Join Date: Nov 2006 Location: Sumweer onat mote o'dust (Sagin) Posts: 21,753 Thanks: 341 Thanked 3,660 Times in 2,924 Posts	And why did the crankcase pressurise to that extent? I'm now thinking about pistons, rings and such. You only saw 75 psi compression after all. A low battery can't affect that. TC

21st October 2009, 13:43	#20
Gary Avid contributor Rover 75 1.8T Club - Mitsubishi GTO Join Date: Apr 2009 Location: Weymouth Posts: 107 Thanks: 0 Thanked 0 Times in 0 Posts	Okay but I think it is unlikely that the rings would go at the same time on all four pistons…………….one piston maybe, but then compression would be significantly lower on one and they are all the same. If the valve timing was out – say the exhaust opening early or inlet closing late then the compression would be down. Even with 75 PSI I would have thought it would have the occasional cough or something. There is no water loss by the way.