Done a sporadic not starting sometimes.  Then one day wouldnt start at all. Its not my car, its my m8ts fathers car. Octavia 2002 1.4 16v. I done a scan and checked fuses. The scan showed up a 17850 - an egr fault, a 01039 - coolant sensor temp and a crankshaft sensor fault. cant remember offhand the number but it was a crankshaft sensor dtc. also the fuse for the fuel pump was blown which i checked coz didnt seem to be any smell of fuel at all when trying to start it. after replacing the fuse. started getting the smell of fuel when cranking it over. Theres a new crankshaft sensor on the way and ive replaced the coolant tempreture sensor.  is there something im missing here on this car. i know dtc codes can be false and send u down the wrong path to sort the fault. its them coil packs on that engine aswell and ive not checked them.  the crankshaft sensor is a complete nightmare to get out. had to remove drive shaft and all sorts to get to it from under the car. such a tight space under the intake side. Any help and advice on this i would really appreciate. im gonna check the resistance on the crankshaft sensor with the new one see if theres a diffirence. which there will be hopefully and if im lucky it will sort the problem.

EGR fault is common on these engines but woudn't stop it starting.

 

A Crankshaft sensor fault would stop it starting and a coolant sensor temp fault woudn't help either. There are two type of coil packs - either one per cylinder or a wasted spark coil pack at the end of the engine feeding plugs via ignition leads (this sort is know to fail but usually fails first by dropping the engine to two cylinders sometimes)

Edited 17 July, 20187 yr by bigjohn

yeah bigjohn, when it was running it didnt have any running issues. So i havent really bothered checking them coil packs. If the crankshaft sensor is really gone faulty as the DTC code sais then there would be no spark would there ? The fuel pump fuse possibly went because of the constant cranking trying to start the car maybe ? Like I say when i replaced the fuse for fuel pump there seemed to be a delivery of fuel cranking over. Could smell it. Crankshaft sensor turned up but was wrong one. Hopefully end of this week it will turn up. Why is such a small engine so complicated and akward to work on? The location of the crankshaft sensor in such a crazy place? The way its fitted in that recess more or less renders the car scrap to anybody without a code reader when it goes faulty. Most people wouldnt even find it from the top or the bottom of the car.  Simple mechanic logistics = check for fuel delivery, check for spark etc etc etc.   One last question. Does anybody even know how common the crankshaft sensor is to go faulty on this specific model. There is not a lot of bulletins on autodata to say anything about it. oh and the coil packs on are 1 per cylinder not a single unit for all.

Edited 18 July, 20187 yr by TheMitch1

Unlikely for all the individual coil packs to fail at once so unlikely to be this.

 

Just to double check - do you have a spark at all?

 

I'm suspicios of the fuel pump fuse failure - was it killed or did it die?

Edited 18 July, 20187 yr by bigjohn

I didnt bother checking  each coil pack for a spark as i assumed after replacing the fuel pump fuse that fuel was getting to the engine. I think there will be no spark because of the crankshaft position sensor failure. Assumption again though. At the time I didnt want to put any more heat on the starter when I was working on it. Status at the moment = waiting for crankshaft position sensor to turn up.

Little update on this. Crankshaft sensor fitted and now power and and readings present. Unfortunately it still will not start. I assumed when I replaced the fuse for the fuel pump before that I was smelling petrol so pump was pumping fuel to engine. But it couldnt have been. Might just have been dormant petrol in the engine itself . Checked the fuse it was ok. Pulled the fuel pump relay opened it up and cleaned terminals. Then proceeded to check for voltage at the pump when the relay would energise. Upshot is that 12vlts present at fuel pump but the pump has siezed. Bit weird to me this as its 1st siezed fuel pump in a car ive ever come across. So changed the coolant temp sensor, changed the crankshaft sensor, changed the fuse for the fuel pump. Now waiting for the new fuel pump to turn up then I will update this again. Prolly at the end of the week.

Update on this....
There was no 12 volts at the fuel pump when put the meter on it. Checked the relay and it was intermittent. Cleaned it all up and had 12vlts going to the pump but pump was seized. Not working. Replacement pump came today. Fitted that and job is a good un. So this fault was as follows:

--------------------------------------------------------

Car cranking over but not starting:

 

Diagnostuc scan done:

crankshaft position sensor fault

coolant sensor fault

EGR fault

 

Replaced coolant temp sensor.

Replaced Crankshaft sensor.

Checked fuel pump fuse. It was blown.

Replaced fuse, was intermittent fuel delivery for few seconds then nothing.

Checked fuel pump. No 12vlt supply.

Checked fuel pump relay, dirty contacts and not making contact.

Cleaned up fuel pump relay contacts and got 12vlt supply to pump.

Pump getting 12vlt supply but was seized. Could hear it trying to start but was seized.

Replaced fuel pump.

 

CAR NOW STARTING BUT RUNNING BIT LUMPY.

 

Blocked off EGR valve. Car now idling and running perfectly.

 

JOB DONE .

--------------