daily driver problem

[shh120m]

Hi guys, hope someone may have an idea to the problem iv got. My astra that i use as a daily driver (05 1.6twinport) has got some sort of problem i cant work out. It lost its timing belt a couple of months ago, but quite luckily it only broke one rocker, which i replaced along with the oil pump bearing (just incase) and a new belt. This may or may not be something to do with it. The engine light is on but the only code its throwing out is a malfunction with CIM interface(steering wheel buttons to you and me).

Now, whats happening is that at around 2k -2.5k rpm the car lunges as if there is a problem with fuel pickup or ignition, its hard to tell. Above 2.5k rpm everythings fine, its just becoming a real pain in traffic and around town. Iv just chainged the oil, plugs, fuel filter and put a new coil pack in. I also left the battery disconected for the day to see if it would reset the ecu. Just taken it for a drive and the problems still there.

Im told that the twinport uses 8v below a certain engine speed, then employs all 16 above a certain speed or that its variable, but to me both cams looked fixed when i had the rocker cover off. Just seems a bit suspicious that its happening at the same speeds.

Just wondered if anyone has a clue to what might be the problem before i go and get shafted by vauxhall.

cheers guys

nathan

[baz-r]

do you have a way of viewing live data via obdII port could be a start and have a poke round the plugs on sensors around the engine

as you say it threw a belt did you have the head off or did you just wing it?

[shh120m]

i have no way of getting any data from it without tech2, so vauxhall may be the only answer at the moment. I never had the head off, i just chanced it that none of the valves were damaged. There was a bit of scoring to one or two of the cams where the bits of rocker flew about. I suspect its gonna be expensive to go down the diagnostics route and its pretty much worthless since my other half bent the passenger door and sill so i might just put up with it till it goes bang! It owes me nowt really, but it would be nice to get another year out of it

[twinturbo]

My M8 has Tech2 at his garage , but that's in Carlisle.

The RPM range ties in with when most VVT/IMRC/VVC/VIS etc systems operate. It can be difficult to diagnose though. However, If you can find out how the system works and disconnect it you should be able to drive but will have a drop in power or torque.

TT

[baz-r]

just a bit of a idea
i have had simular probs with twincams before where thay have not been timed correctly. you will be suprised how well some engines can run a tooth out on one of the cams
more modern cars are touchy with cam timing and meny now are keyless so cams need to be locked and the pullys freed off to allow the cambelt to be tensioned correctly. worth checking if a locking tools need to be used
zetecs where one of thease lots of people just put the new belt on without locking the cams and the belt used to wrap on the cover between the cams
saw one worn trough once :eek:

[flyerncle]

What is the actual code number ie P Code.

Can look it up 2 moro .

[shh120m]

its now showing ECN 17152 on the dash ( fuel trim too lean?)
I dont know what p number that equates to

Thanks,

Nathan

[twinturbo]

Probably P1128

Would indicate

an inlet leak,

or

low fuel preasure

or

injector not firing

or

MAP/MAF misread

or

Fault Lambda


TT

[shh120m]

cheers mate, il get working on that list and see what happens

[twinturbo]

Given the symptoms, the code may not directly be related and may be a red herring to the main problem. I used to get it (221) on my old Volvo 855T5 ocasionaly and on My Scorpio 24V. Even my Galaxy gets it occasionaly.

I would give the car a quick look over on the inlet pipework for leaks, clear that code and then see if it comes back.

Does it use and air flow meter or MAP sensor ?

TT

[Twin]

I had a similar fault (symptoms) on my ford & it turned out to be a air Vv position sensor.

Good luck

[flyerncle]

Look for a leak in the breather pipes as well,prone to falling to bits after a while.

[robo]

Just go and get it plugged in somewhere thats got all the kit. Thats about £60 round here for a mobile spotty bloke thats about ten years old with long spindly fingers. If they know their stuff he will be done in the hour. That alone will save you tons of quids let alone the grief.
You only have to look at an engine in a breakers yard covered in new bits to know that people just start changing everything a bit at a time till it runs properly.

Bob

[shh120m]

All fixed...:D

It took some time, but it turned out that one of the jubilee clips on the air mass sensor wasnt tight enough and one of the two wires to the lambda sensor had corroded/ lost its insulation and it was touching the manifold. I suspect it was a mixture of the two. Sounds a bit quieter now so it must have been sucking air in after the air filter .Thanks for the help guys. Saved a bit of money, which can now be spent on the roadster:D