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Vauxhall Astra F 1.6 16v (X16XEL) 1997 R ***FIXED***

Posted By flashmush 5/27/2010 5:05:22 PM
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flashmush
 Posted 5/27/2010 5:05:22 PM
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Hello Guys, I hope you can help. Me and my boss have been scratching our heads with this one. We have an astra f with the x16xel engine. The car has recently had an mot (struggled through bet test with slight missfire) and full service (plugs, oil filter, air filter, fuel filter, pollen filter). We fitted a new coil pack due to the missing as the spark on 2 + 3 seemed weak. A couple of weeks later he came back saying it wasn't running right and had broken down. We have looked at it and can't get our heads round it. From cold, it will run ok for a few minutes, then it will gradually start to missfire. If you rev it and let it come back down to idle, more often that not, it will stall. If you immediately try to resart it, it turns over as if it has no compression, untill it eventually fires up (with the missfire). If we leave it for a few minutes, it will start up and run ok for a minute or so and then the whole cycle starts again. So far we have tested the compression, which showed up just under 12bar on cyl 1 and just over 12bar on 2,3+4. I have also tried a second hand set of injectors, blocked off the e.g.r valve (the customer suspected this might have been an issue before), cleaned out the breathers, tried more new plugs, flushed and refilled with 15w/40, checked the timing (top half only), checked ecu for codes (found code for egr [i had disconnected it!] and also o2 sensor) and tried a new ecu temp sensor. All to no avail. Can anyone help? This is totally confusing us and the customer is going to get arsey soon.

Also worth noting - we swapped the ht leads 1+4 round on the coil pack and it made little, if any, difference

we have also block tested for the head gasket and the fluid didn't change colour

Many thanks

Andrew

6/28/2010 10:07:06 AM by flashmush
cartech
 Posted 5/27/2010 5:15:38 PM
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Try using a thinner oil. This sounds like it's over-hydraulicing on the lifters. I never use anything higher than 10w40 semi synth.

If I understood women as well as I understand cars, I'd be the envy of every man.
topbloke
 Posted 5/28/2010 2:45:28 AM
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definatly sounds like the hydraylics are jacking up, or the valves are gummed up possible an italian tune up with some addative in the fuel forte or valvoline may help short term, just wondering if the oil pressure reg is jammed and causeing the valves/hydraylics to jack up,Regards TB
flashmush
 Posted 5/28/2010 9:31:37 AM
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Hello chaps,


Thanks for the input. We've just connected a sealey oil pressure gauge. Autodata says pressure should be 1.5bar at 850rpm. When cold it reads 4bar and with a rev it jumps to 5.5bar.

It is looking like it might be a pressure relief valve problem. Any ideas where it is (we think in the pump), also we were wondering if it might have a seperate valve in the head?

Andrew
Timbo
 Posted 5/28/2010 11:53:56 AM
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1.5bar @ 850rpm will be a hot pressure.

Does sound like excess oil pressure is holding the valves open when cold.

Should have 10w-30 in it.

How does it run when fully upto temperature?

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wor-mate
 Posted 5/28/2010 2:50:39 PM
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oil relief valve can be accessed/removed without removing the oil pump.
topbloke
 Posted 5/28/2010 5:04:38 PM
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its screwed into the side of the pump iirc its the same side as the aircon pump ie front if pump fitted,Regards TB
flashmush
 Posted 5/28/2010 7:00:27 PM
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Timbo - it runs at about 4.5bar when hot, and just over 5bar when revved.

My boss spoke to a main dealer today, apparently they no longer supply the relief valve on it's own anymore. It only comes as part of the pump now - at 180 quid retail! We are hoping to remove it and clean it/free it up rather than replace the pump. We would like to keep the cost down if we can, he is a nice old fella and don't want him to have to shell out if we can avoid it.

I will let you all know what the outcome is.

 

Thanks for all your input,you have been a great help.

Andrew

5/28/2010 7:01:46 PM by flashmush
topbloke
 Posted 5/29/2010 2:59:54 AM
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i would also look at the oil filter it may have collapsed,Regards TB
flashmush
 Posted 6/28/2010 10:04:45 AM
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Heelo guys. sorry to have left it so long, we did finally fix this problem by shortening the pressure relief valve spring. Runs and drives lovely now

Many thanks for your input


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