Thread: Erratic TD5 idle

What's the operating temp?

Some folks say low-mid 80's. some say high 80's to low 90's.

Mine runs consistently in the high 80's to low 90's. IIRC max I've seen on a 30 degree day and AC on was 92 for a brief moment .. generally maxes at 90-91.
Much more consistent than my Tdi.

This is using the nanocom to get numbers tho.

Could the issue you describe have soemthing to do with temps?

I've never noticed on mine. I will look out for any variance for 'ya too from now on.

Any temperature above 75-80° I guess.

Not all do it, but some definitely do, and I can't pinpoint why.

I should add that of you haven't noticed it, it's probably not doing it.

The ones I've seen are quite pronounced.

Mine is as steady as a rock.
Perhaps injector washer leaks are to blame and they are pretty common.
perhaps look at the injector percent variation on a Nanocom, and it may give a clue.
Regards PhilipA

Originally Posted by PhilipA

Mine is as steady as a rock.
Perhaps injector washer leaks are to blame and they are pretty common.
perhaps look at the injector percent variation on a Nanocom, and it may give a clue.
Regards PhilipA

The injector washers are worth a look for sure, it's something I've considered.

I still think there is other issues at play but I'll be happy if it's just washers.

The injector balance is pretty normal though.

You're right about the early ones. I wish the rest of the car was as reliable as the 10P idle.

Erratic as in lumpy / hunting, or going to higher idle then back, but smooth?
1 of my own has done it on occasion ( the auto ), I'd thought it may have something to do with the egr not being mapped out at the time then promptly forgot about it till now. I thought it a little strange as I didn't have HVAC on . Was smooth but idling high until I selected drive

Bit hard to describe.. But I guess when the A/C engages it takes too long for the engine to respond, it eventually does but then over runs.

Some days even without the A/C, it just has a random idle, about 760 then suddenly drop 100 rpm then make it up.. Then over run again, it'll happen for 30 seconds, then go away for a bit.

I can see exactly what it's doing in the logging I do, but can't see why!

Only one I had do that ( as in idle low, then up to normal ) had retarded cam timing, but always worth replacing injector washers/ bump clearances if they haven't been done for a few years while the covers off.