starting problems

[lee1210]

hi there i have a astra mk2 gte 8v just finished putting engine back together after rebuild but cant get it to start have checked every thing is where its ment to go car turns over but not getting any spark from coil but getting voltage any ideas what it could be have tried 3 different coils butr still no spark

 

[HDi fun]

Magnetic reluctor pickup in distributor or crankshaft position sensor?

 

[obi_waynne]

Is there current coming out of the coil?

 

[lee1210]

am getting 12v out the coil 10v when turning the car over

 

[lee1210]

will check crankshaft sensor as was getting fault code up for that but did change it to another one I had but didn't check it

 

[HDi fun]

Does it crank enthusiastically or does it sound 'weary'?

It might just be that with only 10v at the coil under starting conditions there's not enough to create a decent spark on the HT side.

If you have an oscilloscope then stick a probe on the low voltage side of the coil and see what's happening. It might be the amplifier (gate) between the sensor and the coil itself which is faulty.

 

[lee1210]

where would I find the amplifier to check it if you can or would I have to get new part crankcase sensor is spotless and no breaks in the cable is there a way of testing it to see if it works other than visual check as looks as good as new

 

[HDi fun]

I suspect you'll need a scope to check it. In the family 1 OHC engines the amplifier was adjacent to the coil. I am not sure about your car to be honest.

Try posting in the Vauxhall forums - - - http://www.torquecars.com/forums/f40/

You really need someone who has better knowledge of these engines than I have.

 

[lee1210]

have chased the cable back from the coil one is just a switched live the other goes back to terminal 1 on the ecu could it be an ecu fault?

 

[lee1210]

have put post on the astra forum but not had any replies

 

[HDi fun]

It could be but if the ECU is showing a fault code then that's fairly unlikely. Vauxhall, for years, has stuck with the trial&error style diagnostics whilst most other makers have included their own model specific OBDII codes to assist diagnosis of faults.

Get a meter on all the cables and check that they are electrically sound.

 

[lee1210]

all the cables have been tested that's how found out it want back to ecu the other cable just picks up a switched live the ecu picked up fault code for crankcase sensor but not since I have changed that over but still not getting a spark from coil

 

[bill]

Hi I have an audi a3 1.8t the dash lights come on but the starter motor does no kick in there is no clicking coming from the starter motor but there is 2 relay that click

 

[jarrus]

Hi I have an audi a3 1.8t the dash lights come on but the starter motor does no kick in there is no clicking coming from the starter motor but there is 2 relay that click

charge the battery

 

[turbonutter69]

Could be a dead battery or a shot starter motor.

Hi I have an audi a3 1.8t the dash lights come on but the starter motor does no kick in there is no clicking coming from the starter motor but there is 2 relay that click