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[Radar]

Following on from tech2 sess. at the oxford meet it threw up a code 19 so changed the crank sensor today (genuine gm from stealer) and drove for 30 minutes and the stuttering that i had whilst driving to the meet at the weekend did not come back.

But she is still a bit lumpy on idle and wondered if anyone had any ideas why? It started to absolutely tip it down so i couldn't get round to cleaning icv, egr and maf? Is there anything else worth looking at?

Also after 30 minutes drive i let her idle for a bit and could hear a tinny ticking coming from the rear / mid exhaust section but not sure (i.e. engine was warm).

Lastly there is a bracket which connects to the bulkhead from the a/c pipe with a 8mm torx screw - i think i have buggered the thread as it no longer holds tight - i dont have a die set and wondered if i can secure this another way?

Thanks

[feeutfo]

Remind me, what work did we do on it..?

Thinking coil PAC... Perhaps..?

[Abiton]

I'd start with EGR.  If it's sticking open even a tiny amount, the deep vacuum at idle will pull through a load of exhaust gas that the ECU is unaware of, causing mixture mayhem.

[TheBoy]

Clean the ICV, as discussed

[feeutfo]

Ah, lumpy at idle, or idle is varying....?

[Radar]

Will clean the icv and egr and report back Thanks TB / Abiton:y (is it worth doing maf?)

Chris - I watched whilst you did cam cover gaskets on passenger side and put in new ht leads (Last christmas) .
I changed spark plugs, dispack and crank sensor in the last month.

P.S. I would say it is idle is varying.

[TheBoy]

Don't touch MAF, likely to do more damage than good

[albitz]

Dont clean the MAF.Its too fragile.



great minds.........
fools seldom.........

[feeutfo]

Ok as said then.

But don't clean maf.

Unless someone knows what to clean it with without killing it...?

I don't think maf is suspect though is it...?

[Radar]

Thankyou.

[Nick W]

Lastly there is a bracket which connects to the bulkhead from the a/c pipe with a 8mm torx screw - i think i have buggered the thread as it no longer holds tight - i dont have a die set and wondered if i can secure this another way?

Thanks

Loctite a short length of appropriate studding(probably M5) into the thread and use a nut.

[Radar]

Cheers Nick

[Radar]

Cleaned the icv and egr valve and took for a spin. The idle holds steady for a bit then dips and engine judders and the sequence repeats itself.

Is the inside of the egr valve supposed to be silver? like the icv valve. I cleaned with wickes paint stripper and a toothbrush then let soak for 3 hours and some carbon did come out but the insides were brown (but no deposits if you know what i mean?). Should i have left it to soak for longer.

Any pointers appreciated

[feeutfo]

Carb cleaner is usually fine.

Did you lubricate it? 3in1 or similar light oil.

[Radar]

I cleaned the icv with carb cleaner then lightly oiled.

EGR was cleaned with paint stripper, then carb cleaner but no oiling after.