Odd Hestitation On Change Of Afm

[pugbliss 0]

Hi all

 

I thought id have a look at my engine to see what is making it run sluggish (this is after a full service and timing set) i double checked the spark plugs, leads and dizzy cap and all is well, i then looked at the afm to find i had a wrong code ending in 003 so i got another (056) off ebay and it arrived in a desent state...so i fitted it.

The car now starts fine but upon driving i get a very hesitant drive in all gear and revs. what has gone wrong??????? could i have bough a duff afm or what..... my old afm (033) on the car was smooth but lacked any real power below 3 thou revs....

 

any help appriciated

[pugbliss 0]

anyone at all???

[lee-bg 0]

What is the car ?

As far as i know on mi16 and 1,9 8v AFM are all the same. I can check bosch code on mine (i got 2) and tell you the number. the 1,6 AFM is different (as i read somewhere).

It could be the new AFM is sticky - i.e. the flap door doesnt open good or its potentiometer is f***ed/dirty, so doesnt send good info to ECU.

[j_turnell 137 3 Cars]

Have you had the car on a Co machine as all afms are set different as they are used on different engines so it could be running lean or rich, its not just a case of pluging a different afm on.

[pugbliss 0]

unfortunatly i havent had it on a co machine since the last mot.

[pugbliss 0]

does anyone know what afm with end code 033 belongs to?

[sherly 0]

What is the car ?

As far as i know on mi16 and 1,9 8v AFM are all the same. I can check bosch code on mine (i got 2) and tell you the number. the 1,6 AFM is different (as i read somewhere).

It could be the new AFM is sticky - i.e. the flap door doesnt open good or its potentiometer is f***ed/dirty, so doesnt send good info to ECU.

mi16 and 1.9 airflow meters aren't the same in the UK unless the 1.9 is a later motronic catalyst equipped car

does anyone know what afm with end code 033 belongs to?

If it's 0280202033 then it is used on quite a few vauxhalls (Astra GTE etc).

 

056 is the right number for 1.6 and 109 for 1.9 IIRC

Edited June 13, 2007 by sherly

[pugbliss 0]

so why would fitting the correct afm mess up the performance so much??

[simonb 0]

You can't exclude the possibility that the AFM has been tampered with in the past. Just try giving it a refurb and setting it up with a gas analyser.

It could also be fecked I suppose as so many of them are...

 

Forgot to add... it sounds like it's running lean, i.e the spring inside is too tight. Loosen it off a bit (3 - 4 clicks) and see how it feels then. If it's OK, check the colour of the plus after a run and make sure it's not running lean or too rich and away you go.

 

HTH

Edited June 13, 2007 by simonb

[KRISKARRERA 2 1 Cars]

I want to know why those things are so expensive brand new!

[simonb 0]

It's like anything - one or so companies make them so can pretty much charge the earth. All they are is a potentiometer at the end of the day.