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Z20LET Astra 2005 non start

Posted By Josho Tuesday, January 08, 2019 10:40:06 AM
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Josho
 Posted Tuesday, January 08, 2019 10:40:06 AM
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Struggling with this a little.

Car came in a while back as a non start, managed to get it running but poorly. Anyway pre cat lambda was down and causing fueling issues.

Car has been modified, no cat etc and all tuned up. Anyway new lambda and all good.

Customer weeks later stopped at petrol station, car then would not start.

I've been all over it. I then discovered timing clearly a tooth out on the crank. Both cams inline but crank definitely 1 tooth out.

Belt was loose to retimed and still nothing.

You can smell fuel. There is spark and the trace using a scope and an ignition probe looks good however plugs are wet with fuel.

150psi on cyl 2 3 and 4 but 120 on cyl 1.

Cam and crank look good however I haven't scoped it yet as I've sprained my ankle and am now in bed!

Just getting a tad confused. We've got air fuel compression and spark so why is it not even coughing!

Plugs all look good.

I noticed timing out as I used a screwdriver and lined cams up and the screwdriver was slightly lower than tdc on cyl 1. Then the crank Mark's confirmed.
wor-mate
 Posted Tuesday, January 08, 2019 1:19:41 PM
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Are you sure it was petrol that went in at the filling station

Will it fire on a sniff of start you bazza

Compressions a tad low but you would still expect some reaction

Not uncommon for some of the older gm motors to be just off tdc crank timing mark aligns
Tuesday, January 08, 2019 1:22:28 PM by wor-mate
Josho
 Posted Tuesday, January 08, 2019 1:29:54 PM
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Cheers mate. Definitely petrol.

The crank was out moved back and fine however has it jumped since breaking down as it was running fine beforehand I had driven it a few weeks back.

My next steps are going to be scoping crank and cam and the MAF. Coolant sensor is showing 9c which was correct.

Then I will try pulling fuel pump relay and some starting fluid.
SB126
 Posted Tuesday, January 08, 2019 2:01:00 PM
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Have you taken the pullys off and verified, the lugs are still there,
Josho
 Posted Tuesday, January 08, 2019 2:08:26 PM
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I haven't admittedly.
Josho Marked As Answer
 Posted Wednesday, January 09, 2019 11:53:01 AM
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I dont really know whether to call this a fix or not.

Left overnight with plugs out put plugs in and fired first flick of the key.
Thema
 Posted Wednesday, January 09, 2019 12:23:57 PM
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But is it running well? And when you took the plugs out, you said they looked good, were they wet? If not then it's a bit mysterious. Rather like how it got an MOT on a 2005 with no cat.

Peter
Josho
 Posted Wednesday, January 09, 2019 2:44:33 PM
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Yes they are wet. Seems to be running spot on! The trouble is I hate working on poorly tuned up vehicles!
K And R
 Posted Wednesday, January 09, 2019 5:38:19 PM
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josho

"I then discovered timing clearly a tooth out on the crank. Both cams inline but crank definitely 1 tooth out."



The crank is the master (it drives the cams) so it cannot be a tooth out. And if the timing was out how did it fix its, self ???


Kev.

"If you dont KNOW how it works, don,t try to test or fix it"
Josho
 Posted Wednesday, January 09, 2019 8:31:01 PM
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I retimed it.

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