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Re: '87 535i, a couple of questions (archive)

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Posted by Chris W. on January 29, 2001 at 13:03:07:

In Reply to: '87 535i, a couple of questions posted by Mat on January 29, 2001 at 11:11:30:

Hi Mat,
Congrats on your E28. Your mileage translates to 16.8 miles per (US) gallon, which is what we speak here in the US. That's a bit on the low side, however it depends quite a bit on the type of driving you do, which you don't indicate. Could be correct mileage if you do stop and go type, and if your driving is such that the car never really warms up. On my 110 mile commute, I average 21-23 mpg, according to the OBC. My commute is almost all highway at 60-70 mph.

About your starting, it doesn't sound too bad. A few seconds, as in 3, is fine, IMHO, however if it's 15 seconds that's too long. Long crank time could be a sign of an injector leaking, which reduces the fuel pressure in a stopped engine, which has to build up again while cranking. Long crank could also be a non working cold start valve, but in this case stuck closed, not open.

Chris Whitney
'88 535i

Hello. I bought a 1987 535i about four months ago and the car in great. I could not imagine how driving could be so much fun.

I have a couple of questions about the car. First, the fuel consumption. At the moment, the car takes about 13-14l./100km and I would like to know what the average consumption is for these cars. I have to say that I have a Dinan chip, so I don't know if it raises the fuel consumption.
Also, when it's cold in the morning, the first time I start the car, it always takes a few seconds before the engine starts (sometimes, a long few seconds, especially when it is very cold). But, the car always starts and after, there is no problem for the rest of the day. As I read the tread about fuel consumption, I was wondering if it could be related to the cold start valve. Some people said that a broken cold start valve could be the cause of excessive fuel consumption (assuming I have such a problem) and, by deduction, I'm wondering if it could also be the cause of the "troubles" I have in the morning.

Thanks for your help, hope my english was clear enough.

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