93 golf misfire - what am i missing

Ive got a 93 1.8 Golf. Its the one with an ABS engine, single point fuel
injection. Now, its got a regular misfire on number 4 cylinder. Its got
new HT leads, rotor arm and dizzy cap and theres definitely a spark at the
plug and the leads are in the right order. So I think 'it must be fuel
then' but its a single injector. What am i missing? The only thing i can
think of is that the inlet valve isnt opening correctly because of a worn
cam or something?? Is this likely? Any ideas golf gurus?

In rec.autos.makers.vw.watercooled, kembers wrote:

>Ive got a 93 1.8 Golf. Its the one with an ABS engine, single point fuel
>injection. Now, its got a regular misfire on number 4 cylinder. Its got
>new HT leads, rotor arm and dizzy cap and theres definitely a spark at the
>plug and the leads are in the right order. So I think 'it must be fuel
>then' but its a single injector. What am i missing? The only thing i can
>think of is that the inlet valve isnt opening correctly because of a worn
>cam or something?? Is this likely? Any ideas golf gurus?

I don't know about them, but I might try replacing/rotating the
spark plug. Conceivably the plug could spark in air, but have a
problem under compression. Improbable, yes, but cheap and easy. Or
maybe you already replaced plugs and figured that went without
saying.

thanks for the suggestion but I already changed the plugs
:-(

compression check time!

"kembers" > wrote in message
lkaboutautos.com...
> Ive got a 93 1.8 Golf. Its the one with an ABS engine, single point fuel
> injection. Now, its got a regular misfire on number 4 cylinder. Its got
> new HT leads, rotor arm and dizzy cap and theres definitely a spark at the
> plug and the leads are in the right order. So I think 'it must be fuel
> then' but its a single injector. What am i missing? The only thing i can
> think of is that the inlet valve isnt opening correctly because of a worn
> cam or something?? Is this likely? Any ideas golf gurus?
>

Ah - forgot to mention that I already checked compression and all cylinders
were fine.

>From: "kembers"
>Ah - forgot to mention that I already checked compression and all cylinders
>were fine.

So lets see,
you checked the compression = fine
you changed the spark plugs and wires = fine

So I would guess you either have a vacuum leak or maybe bad/weak valve springs
in the cylinder head. :-(
Does the brake booster vacuum hose hook up near #4 cylinder intake area?
How do the brakes feel and do you hear any hissing at any time?

JMHO and let us know what you find!
later,
dave
Reminder........
Before you criticize someone, you should walk a mile in their shoes. That way,
when you criticize them, you are a mile away from them, and you have their
shoes. Frieda Norris

Brilliant. you are a genius (and I should have thought of that). It was a
tiny split in the rubber joint from the brake pipe to the inlet manifold.
I replaced the pipe and the motor is purring again. thanks again dave.
Stewart

large or small paypal donation will not be refused! lol

glad it was a simple problem! :-)
enjoy!
later,
dave

"kembers" > wrote in message
lkaboutautos.com...
> Brilliant. you are a genius (and I should have thought of that). It was a
> tiny split in the rubber joint from the brake pipe to the inlet manifold.
> I replaced the pipe and the motor is purring again. thanks again dave.
> Stewart
>

>From: "Woodchuck" XX
>
>I tried that, do you want to know the results?

yes
later,
dave
Reminder........
Before you criticize someone, you should walk a mile in their shoes. That way,
when you criticize them, you are a mile away from them, and you have their
shoes. Frieda Norris