Quote:
Originally Posted by Challo
Hi All,
Firstly apologies for this thread as I know i have asked questions on other threads, but I thought a separate thread for my car will help me work through the problems. Also while I'm happy to service my cars, and fix issues I'm a complete newbie to car electrics and troubleshooting. As such I will no doubt be asking lots of stupid questions so please humour me as much as possible.
The car itself is a 1990 740 GLE auto with the B230F engine with 90k miles. It was running up to Dec 2020 when the MOT ran out and sat in a field for the last few months till i bought in Feb and got it back home. Apparently prior to the MOT running out it was running lumpy but that's all i have. The owner wasn't really a car guy and just ran it for 2 years with no servicing. The car itself looks clean underneath and doesn't appear to be any rust in the footwells or on the sills.
Current issue is that I cannot get it started. The car will crank but will not fire at all. I have done some reading and changed the following:
1. Battery - The previous one was flat initially and while it did charge, it kept running flat so thought bite the bullet and get a new one.
2. Bougicord HT Leads - The ones on the car looked old, and heard good things about these.
3. Spark Plugs - The old ones where black and oily. Fresh plugs installed, but I do need to re-check the gapping.
4. Fuel Filter - No history on when this was changed.
5. Fuel Pump - I know this might not be the issue, but the old one looked crusty and while changing the filter I thought might as well get a new pump on the car.
I have ordered a new Fuel Pump Relay as the one on the car is from 2005 and thought worth ordering just incase. I know it seems like I have chucked alot of parts at the car, but some I was going to change as the history is scarce and its a 30year old car. I have just ordered a new multi meter as my one is broken to test some of the electrics.
My main concern is I cannot hear the fuel pump prime when I turn on the ignition. From a post on the FB group I have been advised to check power to the pump with the multi meter, then check the fuses and power to the fuse box and then the relay. I can feel the relay clicking so I don't think its this but will check again to be sure.
I will hopefully get testing this week once the multi-meter arrives, but anything I should check at the same time to cross off the list?
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Are you getting spark at the plugs? Measure the voltage at the fuel pump wiring to confirm working. If same as 940 inside left boot cubby hole.
Did you empty old fuel and lines? Any rust sediment? When you crank does the rev counter move a bit? Have you replaced the disi cap and rotor arm?
Great on saving a 740.
James
