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Author Compression tests, wet/dry
gavin18787
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Registered: 22nd Feb 05
Location: Basildon, Essex
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13th Feb 08 at 18:17   View Garage View User's Profile U2U Member Reply With Quote
Going to get myself a compression guage and do one of these on my car as its using a bit of oil and I want to diognose the problem.


Any tips for doing these compression tests. I was just going to follow the guide in the haynes manual as im not uber car mechanical



PS why do you have to hold the throttle open to do it? And should the engine be cold to run the test?



Cheers Gavin

[Edited on 13-02-2008 by gavin18787]

Drives supercharged Tec with torque
Vaux Lad
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Registered: 15th Dec 04
Location: Stoke-on-Trent
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13th Feb 08 at 18:45   View User's Profile U2U Member Reply With Quote
Engine should be warm.
All four spark plugs out
Throttle wide open.
jambo166
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Registered: 27th Nov 06
Location: WHITBY
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13th Feb 08 at 19:00   View User's Profile U2U Member Reply With Quote
doesnt matter if the engines warm or cold u can do a compression test on an engine thats laid on the floor
gavin18787
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Registered: 22nd Feb 05
Location: Basildon, Essex
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13th Feb 08 at 19:01   View Garage View User's Profile U2U Member Reply With Quote
Why is the throttle to be wide open?

And is this why you take the relay out the fuel system to stop it flooding?

Drives supercharged Tec with torque
gavin18787
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Registered: 22nd Feb 05
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13th Feb 08 at 19:08   View Garage View User's Profile U2U Member Reply With Quote
quote:
Originally posted by jambo166
doesnt matter if the engines warm or cold u can do a compression test on an engine thats laid on the floor



But would the results differ?

Drives supercharged Tec with torque
jambo166
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Registered: 27th Nov 06
Location: WHITBY
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13th Feb 08 at 19:09   View User's Profile U2U Member Reply With Quote
when ever ive done mine ive never had the throttle open at all and ive never taken the feul relay owt eighter i take 1 plug owt at a time just turn the engine ova a few times get my reading then replace the plug then on to the next one this is exactly how i did it on my let it was laid on the floor freezing cold and im still running it now 1 year later so i would say there is no problem doin it this way
gavin18787
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Registered: 22nd Feb 05
Location: Basildon, Essex
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13th Feb 08 at 19:13   View Garage View User's Profile U2U Member Reply With Quote
Yer but if it was laying on the floor I assume it wasnt connected to a supply of fuel

Drives supercharged Tec with torque
jambo166
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Registered: 27th Nov 06
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13th Feb 08 at 19:16   View User's Profile U2U Member Reply With Quote
no but what im saying is this is how ive always done them mate it was just an example ov 1 ov the times and that it doesnt need 2 b warm
gavin18787
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Registered: 22nd Feb 05
Location: Basildon, Essex
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13th Feb 08 at 19:20   View Garage View User's Profile U2U Member Reply With Quote
hehe I know I was just been annoying

Thanks for the input, although I think if I do the dry part warm I will do the wet part the same as this will keep the results as accurate as possible

Drives supercharged Tec with torque
corsarob18
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Registered: 29th May 07
Location: north wheatley
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13th Feb 08 at 19:24   View User's Profile U2U Member Reply With Quote
the way we do it is: take 1 plug out at a time and disconnct all the ht leads or what ever you have, so the engine can only crank over and not fire! there is no need to hold the throttle open! do dry compression tests 1st then use oil and test again.
Warren G
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Registered: 14th May 06
Location: Kent
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13th Feb 08 at 19:28   View User's Profile U2U Member Reply With Quote
disconnet cranks sensor - stops fuel being injected

remove ALL four plugs

Crank with throttle wide open
gavin18787
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Registered: 22nd Feb 05
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13th Feb 08 at 19:38   View Garage View User's Profile U2U Member Reply With Quote
job for tomorow


PS warren your sig just made me lol

Drives supercharged Tec with torque
Warren G
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Registered: 14th May 06
Location: Kent
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13th Feb 08 at 21:03   View User's Profile U2U Member Reply With Quote
i think we know the answer tbh, in that link you sent me
gavin18787
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Registered: 22nd Feb 05
Location: Basildon, Essex
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13th Feb 08 at 21:09   View Garage View User's Profile U2U Member Reply With Quote
In regards to my second u2u what are my options, dont really want to try and fix it yet again and fail

Drives supercharged Tec with torque
Warren G
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Registered: 14th May 06
Location: Kent
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13th Feb 08 at 21:20   View User's Profile U2U Member Reply With Quote
which u2u was that - sent it again

i got one with no replay on one of them!
gavin18787
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Registered: 22nd Feb 05
Location: Basildon, Essex
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13th Feb 08 at 21:21   View Garage View User's Profile U2U Member Reply With Quote
ok I will send it again


Thought you was ignoring me

Drives supercharged Tec with torque

 
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