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Discussion Starter #1
hello all
first post and new to alfa
i have a 98 2.0 ts gtv and i love it , I have had loads of cars fto's Mazda coupes etc...
but none have come close to the alfa
I have a problem with it missing below 4000rpm and lumpy
idle.I have changed the maf (Bosch)and I have cleaned the throttle body
there is no engine managment lights on . did find a split in the
air intake pipe but I have repaired this using duck tape
I would be gratefull for any help you guys could give.
thanks Paul
 

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Take the plastic cover of or if you have a ph1, take of the metal cover.

Take out the spark plugs individually and check the condition of them. Ideally you should be looking for a light brownish end of the 'spark' plug end. If you have that colour the engine is in good condition and not overheating. If its dark and sooted you could be running a very strong mixture that is causing the odd miss fire as the plugs are fouling and not 'sparking' properly.

or..

It could be that the ht cables are 'arching' against the metal cover of ph1 models and need holding down with some cables ties.

or..

Your rocker cover gasket has reached old age and needs replacing as it could be leaking engine oil into the spark plug holes and filling up with engine oil, causing lumpy running below 4000rpm.:)
 

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Discussion Starter #4
thanks gtv 73
i have a p2 , anyway driving to work this morning the car was missing really
badly below 4000rpm but smooth and powerful above 4000rpm
Parked it at work and Tickover was really bad , popped the bonnet disconnected
the maf idle then settled down went for a spin no jumpy hesitations
so far I have bought a copy maf a ching Chong china one which made things worse
and a secondhand ( I promise you it works )one
do you think this is my problem or could it be something else
I don't want to shell out 140 quid just to add to my ever growing collection of maf's
please advise thanks Paul
 

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Hello Paul,

Before you spend anymore money, go down the route of checking the spark plugs and the condition of them. It will give you a good indication of the engine whether it is running too rich or the rocker cover gasket is leaking due to old age.

I know it sounds silly but make sure that the ht leads are connecting properly to the tips of the spark plugs, one could have come off and is just 'connecting' to the plug causing the running problems below 4000rpm.

The above will cost you time and no money. What you have done with the maf, air leaks etc etc sounds good, so I wouldnt spend anymore money in that department.

Also do a ecu reset. It will reset all the settings for the car. Let me know how you get on.

Cheers
Sean:thumbs:
 
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Oil in the plug wells can cause this. The fact the car runs ok with the MAF disconnected tells a story though...and don't use the Ying Tong Tiddly I Poh MAF's. Lots of people on here have reported them not working properly.
 

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Discussion Starter #7
just to update,car running like crap with all the symptoms of my first post
I Still have the maf disconnected so I guess this isn't the problem
I have had a chat with a alfa breaker/ specialist and he thinks it is a lambda fault
If this is the case does the car have pre and post cat sensors and if it has two which
one is more likely to go
Are copy lambdas ok or do i buy Bosch or NGK
thanks Paul
 

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Please dont buy copy lambdas, you'll be wasting your money. Go for the original manufactors replacement.

The Gtv ts has only one sensor, and its pre-cat. I think, if my memory serves me well, only replaced mine back in the summer :lol:

I know it sounds silly but have you got the maf sensor unit and housing facing the right way, you'll need to look for the arrow indicating airflow into the engine...the mesh type 'thing' needs to be facing the air filter.
 

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Discussion Starter #9
yeh sensor is facing the correct way
going to try replacing the lambda,just wish it was sorted
so I can enjoy the full potential of the car
thanks for your help so far
 

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Oil in the plug wells can cause this. The fact the car runs ok with the MAF disconnected tells a story though...and don't use the Ying Tong Tiddly I Poh MAF's. Lots of people on here have reported them not working properly.
How do u clean the oil out of the plug wells?? Ive got lumpy misfire in idle & diag has come up with random misfire on cyl's 1 2 & 3 & I cant fix the damn thing!! Btw fyi, all plugs replaced, tried coil swapping, plenum+sensors+connections all gd & cleaned etc... I dunno
 

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You need to replace the seal around the engine top cover if you want the oil problem to go away... Especially if its cylinder 4.

If its in cylinder 1 you need to stop spiling it when you top up :lol:
 
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