[156for the wife]

Hello all.
Newbie here who has his (wifes) first Alfa.

I'll try my best to describe the problem, then will explain what I have already done to try to resolve the issue

The engine has a idle misfire and a poor pick up. its worse when cold.
The engine managment light was on indicating a no. 4 misfire. I cleared the fault changed plugs, leads and No.4 coil pack. still no different. checked live data on the diagnostic tool and found fuel trim out and what i believe the down stream, (after cat) lambda showing consistent 99.92% reading when the other two were all over the place 0.200 > 0.900 and so on. I've changed all three lambda sesnors and also tried a new MAF sesnor. unplugging each coil pack in turn made a significant drop. after doing all this it runs a little better but whilst driving it keeps losing power, engine light flashes, then it will clear, drive fine again for a little, then power will go again, and so on.
All i'm left with next is to try new injectors.
But i must admit, being a land rover guy this is the first alfa I've ever worked on. so hoping someone would have come across this before and will know exactly what the issue is before i go throwing any more cash at it....
Thanks all:thumbs:

 

[Guest]

I'm assuming its a cf3 engine with 3 lambdas from what you say. The lambda reading for the two pre-cats look about right since they should be switching.

Two things though
a) did you use a new bosch MAF ?
b) did you use new bosch lambdas ?

Also try unplugging MAF - might not idle but see if it helps with power.
Also if you have had engine codes read could you post them ?

Cheers

 

[156for the wife]

Hi Thanks for the reply.

Fault codes:
P0300 - Random multiple misfire detected

P0303 No.3 cylinder misfire detected

P0301 No.1 cylinder misfire detected

P0100 - Air flow sesnor volume signal out of range. (though come up as we disconnected it whilst running.)

Along with P0303 the follwing text accompanied. 'low fuel in tank (below 1/8) low cylinder compression, faulty ignition, faulty egr system, faulty injector incorrect fuel pressure...'

 

[156for the wife]

Oh and yes they were bosch units we used....

 

[Rockhopper]

Have you tried a compassion test?

Oooops! spell checker and slow internet!!

 

[Rockhopper]

Have you tried a compression test?

 

[davealfa11]

disconnecting MAF should bring air temp code as well.................

 

[davealfa11]

coil packs swap them over to other cylinders and see if codes move to them cylinders and when they do say thank you dave lol

 

[davealfa11]

just a thought here ............has the last owner had belt change lately?

 

[156for the wife]

Hi Dave and Rockhooper. It hadnt occured to me to be low cylinder compression as the problem is intermittent, buti will give that a try. dave. i have already tried that thanks. I drfove the car 5 miles yesterday and apart from a slight rough running for the first minute or so. it drove fine all the way into town.

 

[156for the wife]

Took it home from work yesterday. really struggled to pull out on a round abaout. filled up at a station down the road. left the petrol station, seemed fine for a while then misfire returned and stayed all the way home. Engine warning lights come back on so will re-read faults to see whats up now.
Bearing in mind that my engine has the 3 lambda probes. will an engine from a 147 fit. are all 1.6 T-spark engines the same? as now condidering a replacement lump