A bit baffled - running on 2 cylinders

[Blondie1 0]

I have a 93 2ltr 16v. The other day I floored it (although didnt redline) and all of a sudden the revs dropped and there was a loud ish knocking from the engine and it kept cutting out when I slowed down. I assumed big end bearings, until I started it the next day, the knocking had stopped and it wasnt cutting out. However it was 'chugging' like it wasnt running on all 4 cylinders, and stank of petrol. I pulled the ht leads out one by one and 3 and 4 werent making a difference when pulled off. I earthed them to see if they were sparking, which they were, so obviously not a faulty lead/plug or dizzy cap etc (I have bought new leads and plugs now though as it needed it!). I've had a few people suggest a bent valve... but thinking about it, I'd have had to have bent 2 as 2 cylinders are out... whats the chances of bending 2 valves at the same time really?? I will be taking her to a garage the weekend but I would rather try see if it might be somet simple, or see if there is anything I can test first.... Any ideas?

 

Ta :D

[boost monkey 0]

compression test is plan A. If the valves are bent, you will have little or no pressure on those cylinders.

[Reggit 0]

Deffo need a compression test - there's a possibility the head gasket could have blown between the 2 pots as well, this will also indicate very little/no compression.

[Supercharged 2]

Try and get it to Stealth or DG Autotech if you can - both fairly local too you.

[Blondie1 0]

Wouldnt touch Stealth again, spent £400 with them and 3 weeks later my car went back to runnin how it did before I took it to them, they didnt fix a thing

 

I'll take it down to a local garage and get them to do a compression test :D

[RW1 0]

I wonder if the cam belt has jumped a sprocket tooth or may be two when the engine was floored???? Now the valve timing is out. Usually lack power when this happens.

 

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[Blondie1 0]

Timing out would make more sense than bending two valves at the same time i guess... I will mention it to the garage :D x

[boost monkey 0]

If the belt has jumped a tooth, surely all 4 cylinders would be out and not just 2.

[davidwort 0]

My vote is for the HG going between the two cylinders too.

[Blondie1 0]

Turned out to be the head gasket, also needed a cam pulley replacing. I asked the bloke to take a look at why it might be idling high (can be as hish as 2500) as its been doing this for about 3 months now. He said there was something unclipped under the throttle body, so thats been clipped back in..... driving it today and its still made no difference, idling around 2k. Two garage have not been able to sort this out, I have no idea what to do now. Any1 recommend any dub specialists? (apart from stealth, mindland VW and DubUnit)

 

Thanks x

[Supercharged 2]

DG Autotech?

[dragon 0]

sound like what happened to ours Laura did it sound the same when it happened ? If so theres your answer and would be cheeper to engine swap than fix