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Join Date: Sep 2004 Location: Coventry (near Birmingham
Posts: 1,135 Thanks: 2 Trader Rating: 1 ![]() | compression test right im going to do a compression test on my car to see if ive got a bent valve, causing the over fueling, but whats the size of the hole that you screw the spark plugs in to?
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Join Date: Dec 2005
Posts: 98 Thanks: 0 Trader Rating: 0 ![]() | Re: compression test 1. a bent valve wont cause over fuelling 2. you will find it very hard to bend a valve on a fire engine as the piston and valves dont occupy the same space like most engines
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Join Date: Sep 2004 Location: Coventry (near Birmingham
Posts: 1,135 Thanks: 2 Trader Rating: 1 ![]() | Re: compression test wont it cause a smell of fuel to come out the exhaust though? thats what im getting, as the fuel isnt getting burnt.
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![]() | Re: compression test ![]() wont it cause a smell of fuel to come out the exhaust though? thats what im getting, as the fuel isnt getting burnt. Checked all the plugs are sparking? Checked HT leads? Etc...
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![]() | Re: compression test If you are doing a compression test, all the kits i have ever used had a selection of threads on the pipes, so it should'nt matter what the plug size is, there should be the correct pipe in the kit.
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Join Date: Sep 2004 Location: Coventry (near Birmingham
Posts: 1,135 Thanks: 2 Trader Rating: 1 ![]() | Re: compression test ok cheers baildey jamie - all new plugs and leads, changed the coil pack. it runs ok then will get a little miss fire another 20 secs later the same ![]()
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Principality Retained :) ![]() | Re: compression test
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Join Date: Sep 2004 Location: Coventry (near Birmingham
Posts: 1,135 Thanks: 2 Trader Rating: 1 ![]() | Re: compression test cleaned and put back in, will try another this week. cleaned it with a baby wipe, would that have been ok? think i might have killed the cat with the constant overfueling though
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Principality Retained :) ![]() | Re: compression test Cleaning wouldnt have helped if its broken! Cat may be dead yes. Bear in mind that the lambda is only switched into the ECU once it starts in closed loop operation (once the engine reaches certain conditions)....so that initial 20 secs of ok running may be open loop (usually overfuelled to heat up the engine), then it may go rough as the lambda is switched in, and found to be dodgy. Also, the lambda probe failing doesn't cause the ECU warning light to come on....
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Join Date: Sep 2004 Location: Coventry (near Birmingham
Posts: 1,135 Thanks: 2 Trader Rating: 1 ![]() | Re: compression test got a compression test done today and..... no compression at all ![]() would this have caused the smell of fuel?
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Join Date: Jan 2006 Location: Milton Keynes
Posts: 368 Thanks: 0 Trader Rating: 0 ![]() | Re: compression test That can't be right, if it has no compression at all it won't run, and head gaskets don't normally cause catastrophic compression loss, that's burnt out valve, broken rings holed piston territory. If one pot has no compression put a bit of oil down the bore. If you then see compression its rings, no change it's valves.
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Join Date: Sep 2004 Location: Coventry (near Birmingham
Posts: 1,135 Thanks: 2 Trader Rating: 1 ![]() | Re: compression test we tried plugs 1 3 and 4 no compression in any we took the spark plug out, put the compression thing in and fired it up. is that what you do? it runs, can get good power out of it when on the road. but emissioins are too high and the smell of petrol from the exhaust.
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this is where i stand Join Date: Oct 2003 Location: Manchester
Posts: 13,581 Thanks: 289 Trader Rating: 0 ![]() | Re: compression test you don't fire it up, no. Pull the HT leads off remove the plug of what you're testing, and put the tester in. turn it over on the starter a few times, the tester should record the peak pressure reading. If you had no compression in 3 out of 4 cylinders, it wouldn't run.
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Join Date: Jan 2006 Location: Milton Keynes
Posts: 368 Thanks: 0 Trader Rating: 0 ![]() | Re: compression test ![]() we tried plugs 1 3 and 4 no compression in any we took the spark plug out, put the compression thing in and fired it up. is that what you do? it runs, can get good power out of it when on the road. but emissioins are too high and the smell of petrol from the exhaust. Pete
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Join Date: Jun 2006
Posts: 69 Thanks: 1 Trader Rating: 0 ![]() | Re: compression test You don't need to open the throttle if the plugs are all removed. There won't be any significant manifold suction as the air can enter down any of the spark plug holes. You can leave the throttle wide open if you want, but as it spings closed it can be inconvenient.
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