1997 mk3 No OBDII connection to ECU

[itavaltalainen]

Check the temp sensor as well - it has 2 circuits, so even if speedo shows correct the ECU may not get correct temp read back.

AGG has one knock sensor, sits at the front of the engine block above and a bit left of the oil filter. 

[andy_k]

Thanks - hot and cold running makes no difference, it struggles under load (3 adults) if I try and use third around 2000rpm (30 mph) going up even a gentle gradient, much the same for 4th at 40mph.

Other than that, it revs freely up to the red line, idle is smooth and hot and cold starting are both fine.

I'll have a look at the knock sensor tomorrow - does disconnecting it provide a decent test? 

[itavaltalainen]

no disconnecting won't be much of a test.

If there is something wrong I would check measuring blocks....
Depending on mileage check if it still got good compression.

[1981t25gti]

Thanks - hot and cold running makes no difference, it struggles under load (3 adults) if I try and use third around 2000rpm (30 mph) going up even a gentle gradient, much the same for 4th at 40mph.

Other than that, it revs freely up to the red line, idle is smooth and hot and cold starting are both fine.

I'll have a look at the knock sensor tomorrow - does disconnecting it provide a decent test?

[1981t25gti]

Thanks - hot and cold running makes no difference, it struggles under load (3 adults) if I try and use third around 2000rpm (30 mph) going up even a gentle gradient, much the same for 4th at 40mph.

Other than that, it revs freely up to the red line, idle is smooth and hot and cold starting are both fine.

I'll have a look at the knock sensor tomorrow - does disconnecting it provide a decent test?

Thanks - hot and cold running makes no difference, it struggles under load (3 adults) if I try and use third around 2000rpm (30 mph) going up even a gentle gradient, much the same for 4th at 40mph.

Other than that, it revs freely up to the red line, idle is smooth and hot and cold starting are both fine.

I'll have a look at the knock sensor tomorrow - does disconnecting it provide a decent test?

hello

i have the same problem on my t25 that is fitted with an AGG 2.0gti 97 engine and the diagnostics came up with the hall sender was out of range , so i am going to replace it at the weekend , have you sorted your fault yet ?

[itavaltalainen]

hello

i have the same problem on my t25 that is fitted with an AGG 2.0gti 97 engine and the diagnostics came up with the hall sender was out of range , so i am going to replace it at the weekend , have you sorted your fault yet ?

Who has put the engine in there? Where did the engine come from? Maybe someone daft tried to adjust the ignition on the hall sender?

Look at the measuring blocks for hall sender, they must be within 57-60 for the first field and 5-8 for the second. If not try moving it a bit, as a rule of thumb the two pins on the distributor should roughly match up to the mark (hole) on the front.

Only if you can't get it within those marks you would need to think about replacing it!
PS Even if you replaced it you should still check that it comes up with correct numbers in measuring blocks, otherwise it will end up in fault codes agian.

[1981t25gti]

brickwerks in holmefirth installed it last year , its been running ok since then , but i over revved it the other week and its been running like that ever since , the engine came from a company breaking mk3 golfs in stockport , it was a low mileage 97 from a R plate

[1981t25gti]

just been for a test drive with the MAF disconnected and it ran perfect , so i guess it needs cleaning or replacing , not tried it with it plugged back in yet to see if anything has reset itself , as it all seemed to happen after i had a new exhaust fitted