Misfire under load 8-(

   
Hi Guys, I hope one of you has an idea to help me!

I have just had my AMD Remapped  '96 A4 1.8T looked at by my normal mechanic because it has been misfiring  and does this everytime I give it a little extra gas!

He changed the plugs...didn't help
He changed the Coils...didn't help
He even changed the ignition something or other and that didn't help either.

I just drove it home and changed the plugs for myself for new plugs of the correct spec and it made the problem MUCH worse. So I have changed them back and of course the problem is still there but not as bad as with the new plugs!

Does anyone have an idea to help me before I have to give my car to the dreaded Audi Dealer money eater???

Please help...Cheers!

Wow...you didn't really let a person change all that did you? You don't even know what the 3rd thing is???
1st thing you should do - learn about your car (no offense)
2nd thing - get a new mechanic
3rd thing - gap your plugs smaller - .28
 
What kind of plugs are using?

ICM maybe?

gap for sure, it done it to me everytime i dont gap them or get them all the same
 
.028

ya he's talking bout the ICM. sometimes people forget things ya kno, and if you knew the ignition components you would know it's the ICM like turbo said. change your ECT too, it can do funny things to your car when it goes bad. it's a really cheap part and easy to change too. also, get your car scanned for codes and post them here. 

Thanks Guys, all helpful comments, I'll have a go at gapping first!

And fair do's to the mechanic cos he changed all that stuff, and changed it back again and didn't charge me anything cos he hadn't found the fault...a rare thing nowadays!

Cheers again! I'll let you know how it goes..

ps. with the fault diagnostics...no fault code was being shown at all!

Thats the problem!

Gapping the plugs didn't make any difference unfortunately!

What should I try next?

Is there any point in Gapping even smaller than 0.028? Which is 0.7mm by the way  :-)

I've tried gapping them smaller to 0.6mm and it seems to have helped a bit...

What is confusing me is that when I change the spark plugs completely for different new ones the problem makes the car undriveable!

What could that mean?

Cheers guys!

quote:

ORIGINAL: Aviatorlgb

What is confusing me is that when I change the spark plugs completely for different new ones the problem makes the car undriveable!

 
that sounds like gap to me
 
did you try re-gaping the new ones or the old ones?

Hi Jsgrabo,

I gapped the old ones...the new ones are the 4 armed ones and i wasn't sure how to do it to be honest!  :-)

How small can I make the gaps before I start to cause myself problems? I have them at 0.6mm now! It does seem to be helping though, just not quite cured yet!

Cheers.

quote:

ORIGINAL: Aviatorlgb

the new ones are the 4 armed ones
 

 
lol yeah i'm not too sure how you would go about gapping those. well they probably made your car worse because they arent gapped right. maybe someone else can chime in and lets us know how to gap em.
 
maybe your old plugs are just old and need replacing and you just had problems with the new ones because they arent gapped right??? perhaps theres more to it but maybe you could try picking up some cheap single electrode plugs, gap them, and try that to see if it works. Unless of course someone can tell us how to gap the 4 electrode plugs.

jsgrabo,

Glad its not just me then  :-)

Any idea what the minimum gap is that I can use?

...since I saw your youtube videos I just want an S4 anyway!  ;-)

I dont know the exact measurement of the minimum gap but i'm not so sure the gapping is the problem on the old plugs. how many miles do they have on them? I think it's just time to replace them.
 
and yeah, those vids are sickk! 2.7t FTW!!!

You know what...that didn't even occur to me! I was under the impression the mechanic guy had already changed them but then he would have charged me for them I guess  :-)

Yeah thats what I'll do next...I'll get the same type, new and gap them and see what happens!

They've probably done about 6/8000 miles...doh!

Cheers!

Spent a fortune today on the same spark plugs (NGK PFR6Q) and the problem remained exactly the same...

I have the gap down to 0.6mm should I go smaller?

Cheers...

wow, thats not good. sorry.
 
maybe auditech or one of the other techs can chime in and we can get some professional advice.
 
if you still cant get an answer try pm'ing him. auditech79

Might try that...Cheers Mate!

Hey,

I just wanted to let you know in the name of education...  :-)

My problem has been finally solved by an Audi specialist...he has changed all the coil packs and the problem has been solved. The first guy changed them but only ever changed one at a time which I believe is fairly normal procedure to find the faulty one...the second guy thought that it might be more than one and therefore changed them all...job done.

Not the cheapest of repairs but good to have it going properly again!

Cheers for all your help!