Corsa 1999 - Crank Sensor Error After New One Installed

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Corsa 1999 - Crank Sensor Error After New One & Unknown Problem!

Hey everyone. Im about 2 strands of hair away from putting a lit match into my car. Really hoping i can get some decent advice. Corsa 1999 1.4 sedan.

Symptoms:
-Long crank to start
-Low idling until it warms up
-Lack of power (Most of the time, sometimes its fine)
-Will randomly bog down/lose power/stall unless i rev like mad, then it comes back. Like its randomly misfiring. Its very hard to drive like this.
-Getting error code 31 which according to this page is a crank sensor low no rpm signal - http://www.opelclub.rs/forum/showth...ult-code-chart-shows-the-Bosch-Motronic-fault
-Sometimes i cant start in the morning and i have to take out the spark plugs and dry them off, they are also very carbonized.

What i have done:
-ECU (bosch motronic) was checked. Immobilizer/transponder was cleared off the ECU to make sure it wasnt they key that was the problem.
-Changed ALL the sensors, some twice.
-Changed plugs 4 times, changed plug wires twice.
-Changed head gasket and other gaskets in the engine.
-Compression test.
-New battery
-An array of other tests.
-Fuel Pump and line done.
-Electronics have been checked slightly, replaced the crank sensor wire in the harness, but have not pulled the harness out to check all the wiring.
-Injectors have been checked
-Throttle body cleaned/checked.
-Tried a confirmed working Coil pack
-Tried confirmed working fuel relay
-All Fuel, oil and air filter changed

Its with my mechanic (the 3rd one thats checked the car and hasnt been able to come right) and today he is going to check the timing...... This has been going on for a year. When it comes back from him it goes well and then starts the same stuff the next day. He always sprays cleaner into the throttle body and cleans other stuff as well.

Any advice appreciated :)
 
Last edited:
tried different ECU, just to see if that might be at fault?
also alternator diode pack?

had worse symptoms with my Picanto, got stranded twice with it when the ECU went, took 3 different garages to try to diagnose the fault.
second time it happened told me the diode pack on the alternator was faulty,
supplying too much power to the ECU and causing it to blow.

just an idea, not sure if it helps, as the picanto's one is a bosch unit as well.
(Korean car that has German electronics)
 
Thanks for the reply :) Called the mechanic and mentioned that to him.
The ECU has been fully tested twice, dont think its that :cry:
But i did have my alternator reconditioned a few months back so worth a shot!
 
-Tried a different Coil pack (although a second hand one, iv thought about this but the mechanic says its not it)
Click to expand...

My first thought as well, your symptoms does match that of a faulty coil pack, long cranking and stalling. Most tests pointing to a particular component does not necessarily mean that component is faulty.

Since it seems like you have spent a lot of money replacing components why don't you buy a coil pack so that you can eliminate it as the culprit?
 
Just checked with the mechanic, apparently he tried his coil pack from his corsa which is working, same story..... He didnt tell me that before. Post edited. Man. This car.
 
I know of two Corsas that experienced simular issues and both times it was the feul pump. That seems to be n common fault. The one time a dodgy mechanic also lied about replacing the fuel pump and we struggled for months to find the fault after believing him that the feul pump was new.

Good luck
 
Thanks Rietrot. I actually changed the fuel pump myself first to a second hand one and then to a brand new Bosch. Mechanic also confirmed it was installed correctly and did a fuel pressure test i think it was.
 
rietrot said:
I know of two Corsas that experienced simular issues and both times it was the feul pump. That seems to be n common fault. The one time a dodgy mechanic also lied about replacing the fuel pump and we struggled for months to find the fault after believing him that the feul pump was new.

Good luck
Click to expand...

that's also something to try,
 
Fuel Relay? That module that goes in the kickpanel in the footwell?
Fuel Filter changed?
 
Thanks KingMikel. Updated my post. Tried a working relay, and all filters were done.
 
Pitbull do you mean the Mass airflow sensor? If so, thats been changed twice haha.
 
You say that three mechanics have looked at it - have you had a diagnostic run on it by an Opel dealer? Many of the ECU systems have more than just the standard error codes, and a dealer might have access to more information than a generic diagnostic machine. Even if they don't, your mechanics are clearly out of ideas and are just spending your money hoping a lucky guess sorts it out.

You say the ECU was checked. Who checked it? Do you know for a fact that they know enough to confirm that it's working 100%?

I'd take the car to a dealership, and discuss it with the workshop manager. Explain what you've tried and ask them to have a look at it. Try to get his agreement that if they swap out parts and it doesn't solve the problem they won't charge you for them. That way they'll put their best problem solver onto the car and he's got more chance of coming right than a generic mechanic who has no backup from the manufacturer.

If they can't sort it, then perhaps it's time to start looking for a replacement.

Out of curiousity, how much have you spent on it so far?
 
Battery clamps and neutral contact with car in proper condition?
Sounds like a electrical (voltage) problem to me .
 
Mine is at 200 000 km's, besides the normal service the only thing i've replaced is the clutch and the coil pack.
 
Maybe try a computer box from another corsa to eliminate that issue. It could be a fault in the box itself.
Maybe water or moisture got in.
 
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