1996 1.7 TD - Intermittent Starting Fault - chrisinleedsuk
Hi,

My girlfriend has a '96 Vauxhall Astra 1.7 TD with the Vauxhall Low Blow engine and Bosch fuel system.

It's never been the best starter in the world but recently it has become so unreliable she's reluctant to use it. When attempting to start I turn the key as normal and the glow plug lights come on ok, voltage and timing at the plugs ok too. The engine turns over when cranking and sounds to be turning at a reasonable speed, at least enough to start. Sometimes it will start first time others it may take a good few attempts but nearly always when it does start it's within a few seconds of turning the key i.e. increasing cranking time does not have a positive effect. For this reason I suspect the problem is with the immobiliser and not air in the fuel/backdraining or glow plugs or starting / charging system. There was a problem with the main fuel shut-off solenoid but that was more that it wasn't shutting as opposd to not opening. The plunger has been removed to bypass it at the moment and the engine has been starting and stopping on the immobiliser solenoid.

There are three wires going to this solenoid: black/purple switched live, brown earth and white/red which I can't identify but beleive to be some kind of signal. I have read elsewhere that this is actually a data line feeding a signal to a control unit actually on the fuel pump which in turn activates the immobiliser solenoid valve. I tried cutting the white/red wire with th engine running and the engine continued to run but wouldn't restart, this wire will now be rejoined.

Does anybody have any ideas how to get past the immobiliser solenoid or is there something I'm overlooking?

Cheers in advance.
{alteration to header - DD}

Edited by Dynamic Dave on 06/10/2007 at 18:33

Astra Diesel Intermittent Starting Fault - Peter D
When it does start after excessive cranking does it start cleanly or is it belching smoke and running rough for a couple of seconds ?

shouting amended.

Edited by Pugugly {P} on 06/10/2007 at 18:43

Astra Diesel Intermittent Starting Fault - piston power
pull out those glow plugs and heat test them to see if they glow for about 3-4 secs only, it's easy testing them in the head for voltage timer etc but you can't see if they glow!!
it has been a bit colder on a few mornings so this is the time to tell!
Astra Diesel Intermittent Starting Fault - chrisinleedsuk
The fault is evident even with a hot engine so glow plugs aren't really an issue. In fact it's at it's worst if the car's been running for a while at nrt then stopped for a few minutes e.g. to fill up. I'm thinking that maybe heat expansion is adding to the stickiness of a sticky immobiliser valve.
Astra Diesel Intermittent Starting Fault - chrisinleedsuk
It's a bit rough for the first few seconds and there's plenty of white smoke.
Astra Diesel Intermittent Starting Fault - injection doc
when you say it starts rough & loads of smoke it could be air in system draining back from fuel filter caused by air leak. check fuel filter after its been standing all night & see if its still full to the brim if its empty or low its leaking back. 2nd if its the isuzu engine it will most likley be caused by tight valve clearances & can be re-shimed & if its the GM engine I would have a compression test carried out & if its below 280 psi you have got as much hope as bob hope. It will be worth the compression test because it will save you hours of diagnostic checks. Just take it to a diesel specialist for this, do not attempt to use a petrol one for this as it will explode in you face as the compression on a petrol would be about 160ish & a good diesel about 400!!!
Doc
Astra Diesel Intermittent Starting Fault - chrisinleedsuk
It's the good (?!?) old X17DTL Vauxhall low-blow engine. It's probably broken a record to get to 165,000 miles! I'll try checking the filter for loss but do you reckon I should whip off the heatshield the night before as the process of removing means turning and tilting it to all angles?

I have already pressure tested the fuel system by pumping air in from the feed and return pipes (not simultaneously!) at the tank and I couldn't see any leaks anywhere (apart from at the end of the plugged return pipe when it became unplugged and I got diesel in my face, which is nice. I also checked the pipes inside the tank in much the same manner, just to be sure there were no blockages.
Astra Diesel Intermittent Starting Fault - Screwloose
Chris

Astra-F vans used to rot the fuel line coming off the tank - worth a look for dampness.
Astra Diesel Intermittent Starting Fault - chrisinleedsuk
The pipes seem sound and their blue coating is still intact.
1996 1.7 TD - Intermittent Starting Fault - injection doc
.*********
Doc
1996 1.7 TD - Intermittent Starting Fault - jc2
On some early immobilizer-equipped diesels you needed to wait a significant time for the immobilizer to energize the solenoid-if you were too quick the depression in the pump caused by the cranking would hold the solenoid on it's seat and so-no fuel.
1996 1.7 TD - Intermittent Starting Fault - chrisinleedsuk
I'm waitng long enough for the glow plug light to go out if it's cold enough and I'm never in too much of a hurry with it.
1996 1.7 TD - Intermittent Starting Fault - chrisinleedsuk
Does anybody know anything about the third wire (data) that goes to the immobiliser solenoid?
1996 1.7 TD - Intermittent Starting Fault - chrisinleedsuk
Anyone? Anywhere?
1996 1.7 TD - Intermittent Starting Fault - steve591
Hi there, im experiencing very similar problems with a '96 astravan GM diesel, im at exactly the same point by the looks of it, with the 3 wires on the fuel pump! A friend of mine also had the same vehicle and problem, solved by thames vallet electro diesel, for a hefty price! apparently it is a simple wiring modification to bypass the immobiliser, did you manage to find out what to do? or does any1 else out there know?

any help is much appreciated!

Steve
1996 1.7 TD - Intermittent Starting Fault - Screwloose
Steve

It's not a simple wiring mod. Nobody is naive enough to divulge that sort of information on an open forum.

[And the Mods would instantly take it off even if they did.]
1996 1.7 TD - Intermittent Starting Fault - steve591
very helpful, thanks!
1996 1.7 TD - Intermittent Starting Fault - jono84
Hi guys, I've been trawling through the old posts on this site, looking for answers for the intermittent starting problem ive had on my 1997 Astra DTL. From what ive read on other sites, this problem seems to be quite common on models between 1996-99.

Well i've had my astra for just over a year, and the problem has recently got worse. One thing i've noticed is when the ignition is on, I get no power to the stop-solenoid OR the blue+red wire on my bosch fuel pump.

I'm pretty sure its an immobiliser issue, but i've never had any kind of warning lights flashing on the dashboard to indicate a problem with the immobiliser. Does anyone know if it is possible to change the immobiliser without having to change the fuel pump ECU as well..?

Also does anyone know where the ECU is located on the 1997 model? Aside from the fuel pump ECU, ive heard there is another one on the car, but i've not been able to find it anywhere.

One last thing, could anyone divulge any information or direct me to a link about bypassing the immobiliser?

Please help if you have any ideas!
1996/7 Astra 1.7 TD - Fuel cut-off, strange fault - chevrons2
My neighbour's 1996/7 Astra 1.7 TD has a strange problem developing (I think!), related to the fuel cut-off solenoid(s?) on the fuel pump.
He has had difficult cold starting, (turning over for ages, unevenly, then eventually starting with a cloud of smoke and still uneven for a few seconds), so I checked the glow plug feed / timer, and then replaced the glow plugs. I tested the old ones and 3 of them didn't work at all, so I thought 'job done'.
However, I then started the engine to make sure it was ok and it started within a couple of seconds, but it wasn't as instant as you would expect from a diesel (obviously letting the glowplug light go out before turning the key). So I immediately switched it off (so I could try it again) but it carried on running!
If you start the engine and then turn the key off again within a few seconds, it carries on idling. If you then leave it switched off, it will continue idling until about 12-15 seconds after you started it. (So it will run for a total of 12-15 seconds regardless of whether you try to turn it off after 1 second or 11 seconds). It's absolutely fine if you don't switch it off within that time. My neighbour (whose car it is) has never notice the fault, but has probably never tried to stop the engine immediately after starting it!
Anyway, I thought it must be the fuel cut-off / stop solenoid not closing, so I checked the feed to it: there is none (ignition on or off, engine running or not): it is earthed continuously. However, if I disconnect the 3-pin connector in the wiring that goes under the black plastic cover on the back of the pump, (above the cylindrical cut-off solenoid), the engine cuts out immediately (whether within the first 12-15 seconds or after that). One wire to this 3-pin connector has continuous earth, one is earthed with ignition off and live with ignition on, the third wire doesn't give any reading (on a test-lamp screwdriver thingy). I am wondering if the normal looking (as on most diesel cars of this age and older) cylindrical stop-solenoid is permanently stuck open or partially open and whether there is another solenoid (that the 3 wires go to, in the back of the pump), that stays open for at least 12-15 seconds after starting, even if you switch the ignition off again within that time. I can't think why it would need to do this, but presumably it's linked to an ecu or timer or immobiliser or something. When the normal stop-solenoid is working properly (ie closing as soon as the ignition is switched off), having the second solenoid staying open for 12-15 seconds wouldn't make any noticeable difference because the engine would just stop as expected when you switch off the ignition, due to the cylindrical one closing and cutting off the fuel.
So, can anyone throw any light on this strange fault?: Is my diagnosis/theory/guess about a second solenoid correct?
Also, the old type cylindrical stop-solenoid must be open, otherwise it wouldn't get any fuel through and so it wouldn't run. But there is no feed to it, so it must be either stuck open or somebody has removed the plunger, so it needs to be replaced. But then it won't start because the new one will stay shut unless I find out why there is no feed to it. Any suggestions on this?
Thanks.
1996 1.7 TD - Intermittent Starting Fault - Wigi

Hi! Had you solved the problem with your Astra? I have a very similar problem with my Astra 1.7TD and would like to get your input on how you solved the problem. My email address is its4me1964@gmail.com Thanks.

1996 1.7 TD - Intermittent Starting Fault - Wigi

Hi! Had you solved the problem with your Astra? I have a very similar problem with my Astra 1.7TD and would like to get your input on how you solved the problem. My email address is its4me1964@gmail.com Thanks.

1996 1.7 TD - Intermittent Starting Fault - Wigi

Hi! Had you solved the problem with your Astra? I have a very similar problem with my Astra 1.7TD and would like to get your input on how you solved the problem. My email address is its4me1964@gmail.com Thanks.

 

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