Thought I had blown my Engine
31 May 2009, 01:04 AM
#1
Scooby Regular
Thread Starter
iTrader: (7)
Join Date: May 2008
Location: Kent
Posts: 1,169
Likes: 0
Received 0 Likes
on
0 Posts
Thought I had blown my Engine
Was on my way to the little meet at Thurock tonight - bit of spirited driving on the way - came off a dual carriageway, over a roundabout in 2nd normal speed and felt like clutch was slipping with revs but not moving 
Suddenly the revs dropped and it run like a wobbly bag of spanners
Pulled over and the whole car was wobbling. No knocking or banging just REALLY lumpy. Its backfiring quite a bit. Ive unplugged the two coil packs on the turbo side and the idle hasn't changed, so it mis-firing BADLY. Only running on two.
Why would it just suddenly drop 2 cylinders
What would it likely to be? Spark plugs/coil packs or someting else?
Any suggestions/help appreciated guys
Tucker
Suddenly the revs dropped and it run like a wobbly bag of spanners
Pulled over and the whole car was wobbling. No knocking or banging just REALLY lumpy. Its backfiring quite a bit. Ive unplugged the two coil packs on the turbo side and the idle hasn't changed, so it mis-firing BADLY. Only running on two.
Why would it just suddenly drop 2 cylinders
What would it likely to be? Spark plugs/coil packs or someting else?
Any suggestions/help appreciated guys
Tucker
31 May 2009, 09:26 AM
#2
Scooby Regular
Thread Starter
iTrader: (7)
Join Date: May 2008
Location: Kent
Posts: 1,169
Likes: 0
Received 0 Likes
on
0 Posts
Been out there this morning. The Coil packs on the offending pots are fine, as are the plugs.
Next step is a compression test I suppose....
Needless to say I am sh*ting myself.
Anybody with any ideas?
Tucker
Next step is a compression test I suppose....
Needless to say I am sh*ting myself.
Anybody with any ideas?Tucker
31 May 2009, 09:37 AM
#4
Scooby Regular
iTrader: (7)
Join Date: May 2006
Location: Stafford, ST16
Posts: 280
Likes: 0
Received 0 Likes
on
0 Posts
yea get a comp test done - if its bad news then its a strip down regardless of what it is to find the problem. hopefully its "just" a headgasket if it is low compression
Last edited by Hudson; 31 May 2009 at 09:38 AM.
Trending Topics
31 May 2009, 09:49 AM
#8
Scooby Regular
Thread Starter
iTrader: (7)
Join Date: May 2008
Location: Kent
Posts: 1,169
Likes: 0
Received 0 Likes
on
0 Posts
Will have to get it to someone and comp test it
31 May 2009, 10:00 AM
#11
Scooby Regular
iTrader: (7)
Join Date: May 2006
Location: Stafford, ST16
Posts: 280
Likes: 0
Received 0 Likes
on
0 Posts
you can buy a compression tester from halfrauds for about 20-30 quid i think, you might as well get that and DIY at least you'll have a new tool at the end of the day.
i wouldn't think it was a HG problem myself but to drop 2 cylinders at the same time is quite a challenge! You have to ask yourself the question, what could you break to make is miss on both cylinders on the same side of the engine!?
how about one of the cam sprockets jumping a couple of teeth? if the timings out you would definatly get this. did the tensioner get swapped at the time of the HG being done?
i wouldn't think it was a HG problem myself but to drop 2 cylinders at the same time is quite a challenge! You have to ask yourself the question, what could you break to make is miss on both cylinders on the same side of the engine!?
how about one of the cam sprockets jumping a couple of teeth? if the timings out you would definatly get this. did the tensioner get swapped at the time of the HG being done?
31 May 2009, 10:14 AM
#16
Scooby Regular
Thread Starter
iTrader: (7)
Join Date: May 2008
Location: Kent
Posts: 1,169
Likes: 0
Received 0 Likes
on
0 Posts
you can buy a compression tester from halfrauds for about 20-30 quid i think, you might as well get that and DIY at least you'll have a new tool at the end of the day.
i wouldn't think it was a HG problem myself but to drop 2 cylinders at the same time is quite a challenge! You have to ask yourself the question, what could you break to make is miss on both cylinders on the same side of the engine!?
how about one of the cam sprockets jumping a couple of teeth? if the timings out you would definatly get this. did the tensioner get swapped at the time of the HG being done?
i wouldn't think it was a HG problem myself but to drop 2 cylinders at the same time is quite a challenge! You have to ask yourself the question, what could you break to make is miss on both cylinders on the same side of the engine!?
how about one of the cam sprockets jumping a couple of teeth? if the timings out you would definatly get this. did the tensioner get swapped at the time of the HG being done?
Im now thinking its got too much oil with too much pressure and blown the gasket as its too much of a coincedence for both to drop on the same side!!
Not too sure about the cam pulleys skipping or breaking a few teeth... I could open the cover to see if a few have snapped. The tensioner was the original but the rest was new..
31 May 2009, 10:17 AM
#17
Scooby Regular
Thread Starter
iTrader: (7)
Join Date: May 2008
Location: Kent
Posts: 1,169
Likes: 0
Received 0 Likes
on
0 Posts
I turned it over to check the spark and it sounds like a tractor - popping on the 2 pots so it sounds like theres compression there
31 May 2009, 06:49 PM
#23
Scooby Regular
Thread Starter
iTrader: (7)
Join Date: May 2008
Location: Kent
Posts: 1,169
Likes: 0
Received 0 Likes
on
0 Posts
A broken camshaft could be a contender - that would explain it... Tommy_Turbo snapped a shaft a little while ago. He bought my spare head!!
Tucker
31 May 2009, 07:03 PM
#24
Scooby Regular
iTrader: (61)
Join Date: Aug 2005
Location: N.I
Posts: 3,444
Likes: 0
Received 0 Likes
on
0 Posts
Car ran like a bag of bolts backfiring through the induction and exhaust, would hardly rev and nearly done my head in. Changed sensors, coilpacks etc to no avail. Actually had to tow it to start it when cold. Changed airflow meter and sweet as a nut again.
01 June 2009, 07:11 PM
#26
Scooby Regular
Thread Starter
iTrader: (7)
Join Date: May 2008
Location: Kent
Posts: 1,169
Likes: 0
Received 0 Likes
on
0 Posts
Right - tested cylinders 1 & 3. If im right in thinking I should have 140 - 170 psi on each pot, I've got half of what I should have
Reading about 70-80 on both cylinders, so its an engine out and strip down to determine the cause/problem!
Not sure when Im going to have the time to get it out and stripped down - moving house end of the week Will update this thread when i know more!
Thanks for all your help so far guys
Tucker
Reading about 70-80 on both cylinders, so its an engine out and strip down to determine the cause/problem!
Not sure when Im going to have the time to get it out and stripped down - moving house end of the week
Will update this thread when i know more!Thanks for all your help so far guys
Tucker
01 June 2009, 07:23 PM
#28
just as a maybe, my motorbike registered 100 psi compression,so i replaced the rings, re-did the test, still 100 psi,should be 200,yet the bike rides and performs as it should.
so dont condemn it jsut yet but not saying it isnt.
did you perform the test with all the plugs out etc ?
so dont condemn it jsut yet but not saying it isnt.
did you perform the test with all the plugs out etc ?
01 June 2009, 07:34 PM
#29
Scooby Regular
Thread Starter
iTrader: (7)
Join Date: May 2008
Location: Kent
Posts: 1,169
Likes: 0
Received 0 Likes
on
0 Posts
Did the test with both plugs out and with the throttle open too. Not tested cylinders 2 & 4 but i think I will do before it comes out.
I needed to do a new clutch, fit de-cat downpipe and also wanted to paint LOTS of bits like the inlet manifold - so will take my time in my new shed once we've moved in!
Just need to get my workbench sorted and get the car to my garage in the meantime...
I needed to do a new clutch, fit de-cat downpipe and also wanted to paint LOTS of bits like the inlet manifold - so will take my time in my new shed once we've moved in!
Just need to get my workbench sorted and get the car to my garage in the meantime...
Thread
Thread Starter
Forum
Replies
Last Post