Have I got a burnt valve?

[nutbox]

Hi there,
I was wondering if you guys could help confirm my suspicions whether I have a burnt valve or whether my engine needs a bloody good tune up.
Anyway the reason why I ask is because ,a few weeks ago I pick up my van from my friends where had some welding done and when I was driving it home it was popping under accerlaration and had lack of power.

Anyway the engine is a 2.0l AC and has been parked p for a while and today I started it and it sounded bad it was rattling and the engine was rocking from side to side and kinda sounded like it was only running on 3 cylinder
Also I had to turn the van around and reverse it on to my drive which has a slight incline and it struggled and popped.

So I done the piece of paper over the exhaust and tapped against it which to me says that it's sucking into which I thing if I ain't wrong means burnt valves,am I right?

I have got to do a compression test which I hope to do is weekend and see what comes up.

All help appreciated thanks dazz

[itchyfeet]

As you say do a compression test.

[California Dreamin]

Yes do the compression check.
But, this could be a combination of hydraulic tappet drain and or, a plug lead breaking down.

Martin

[sarran1955]

Hello,

More likely to be ignition fault IMHO..

Valves do 'burn out'.. but usually with symptoms.. typically .. spitting on tick over and popping at the exhaust on over run..

Hopefully a cheap fix...

Cordialement..

[988mick]

are you sure the plug leads are on the correct spark plugs.it sounds like an ignition prob to me or maybe a vacuum leak.

[nutbox]

Now it could be a vacuum leak because I checked the pipes and some of them are cracked and I am going to change them ,what sort of size of pipes do I need ?
Cheers dazz

[nutbox]

Well I had a look at the engine to day and first off I found that number 3 and 4 ht leads were swapped around so I swapped them over and started it up and the engine sounded miles better plus no popping

Anyway so I went on with the compression test but I only did it cold,but I will do a warmed test tomorrow if I get a chance.
The readings I got are as follows
1) 26psi
2) 52psi
3) 56psi
4) 56psi

Now I thought these readings were quite low which I gather is because the engine was cold and hopefully when I do it when the engine is hot the readings should be a lot higher.
Anyway I think number 1 is suspect what do you think?

Cheers dazz

[DuaneEddy]

I think you might have a typo - All are 100 PSI short of the mark

[nutbox]

I know I didn't know whether it was because it was cold or whether the compression tester wasn't sealing in the spark plug hole.
The wiki say 87 to 131 psi with a min of 73psi so hopefully a hot test would bring these result I don't really know
The tester is the sort you screw a adaptor in the hole and has a push fitting on the gauge part?
Cheers dazz

[nutbox]

When I install the tester adapter into spark plug hole do I just do it up hand tight or do I nip it up like a spark plug?
Cheers