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[nixoro]

I still have a shaky start when the engine is cold.

Have so far cleaned the throttle body the IACV changed the oil separator, cleaned the egr valve changed the Vac pipe which runs from the EGR to throttle body

Cleaned all the breather pipes including the small drilling in the side beneath the throttle body.

Now thinking maybe another fuel filter and maybe replace the air filter or even the leads.

**Edit** forgot to mention its had a full coolant change and new thermostat recently fitted, also a new rad last year.

Running out of ideas now.

in the passed year its had new plugs, the rocker cover has been resealed.

Can anyone suggest anything else to look at.

All help will be much appreciated.

[STMO123]

Before starting in the morning Roy, give it all a good WD40. If that improves it a lot, start thinking about leads.

[nixoro]

Before starting in the morning Roy, give it all a good WD40. If that improves it a lot, start thinking about leads.

Cheers for the input i shall give this a go Saturday morning

I might just try some new Bosch leads for piece of mind think they are about £30 from Halfords

[Matchless]

Take one of your old leads with you to compare, I think the leads in Halfrauds have the wrong boots on them, they connect OK but are too small to seal to the head on the Ecotec....meant for the 8 valve???

[Nickbat]

Two remote possibilities come to mind.

1) If the coolant temperature sensor is duff, the wrong fuel/air mixture will be supplied by the ECU.

2) If one of the plugs is not quite fully home, you can get less compression until the block gets hot, expands, and "reseals" the plug.

[JamesV6CDX]

Either that or it's a bit of piston slap. Do a compression test and compare the values, I'll be especially interested in Pot 1  [smiley=evil.gif]

[nixoro]

Take one of your old leads with you to compare, I think the leads in Halfrauds have the wrong boots on them, they connect OK but are too small to seal to the head on the Ecotec....meant for the 8 valve???

I had a look at a set yesterday and they didn't look to good.

I spoke with autovaux a few weeks back and they say they can supply me a set for £30 i'd guess they are vx or similar think I may go down this route.

Have noticed since doing the thermostat change the windscreen mist across the bottom could a pollen / air filter be causing my troubles?

[nixoro]

Two remote possibilities come to mind.

1) If the coolant temperature sensor is duff, the wrong fuel/air mixture will be supplied by the ECU.

2) If one of the plugs is not quite fully home, you can get less compression until the block gets hot, expands, and "reseals" the plug.

Option 1 not sure about this where abouts is the temperature sensor on the 2.0 16v so I could check it..

Option 2 might be a possibility but when I changed the plugs they were torqued down so might take a second look and go with new plugs aswell.

[nixoro]

Either that or it's a bit of piston slap. Do a compression test and compare the values, I'll be especially interested in Pot 1  [smiley=evil.gif]

How good are these testers and how do you do the test

Read somewhere you do it with all the plugs removed is this right.

[justme]

It will be one of your sensors, injected engines normally start on the button if they dont then that is your starting point. So before using a sledge hammer to crack your nut check them.  You would notice your compression just on performance of the engine. Everything done to date has been mechanical, you do have an electrical system also just as prone.

[nixoro]

Possible the car has had a new Cam shaft sensor and new MAF sensor in the passed year or so.

Currently I have not had any EML lights appear also did the paper clip test earlier and no codes showed shall be doing this again at some point this week when I am not in a rush for piece of mind.

[cem_devecioglu]

Either that or it's a bit of piston slap. Do a compression test and compare the values, I'll be especially interested in Pot 1  [smiley=evil.gif]

Exactly..

[nixoro]

Thing is imo performance would drop and it seems to run fine plenty acceleration when needed

[cem_devecioglu]

either the compressions are not equal (still my idea) or crankshaft balance (rare I never see)

edit :*********

or sparking is not equal on all cylinders

[nixoro]

either the compressions are not equal (still my idea) or crankshaft balance (rare I never see)

edit :*********

or sparking is not equal on all cylinders

Only happens on start up fine the rest of the time