[gusc]

My '88 3.0L dropped down to 16 mpg from 20-21.

Turned out to be a bad O2 sensor. Replaced it and all returned to normal. The sensor kept the mixture rich all the time, apparently that is the failure mode.

 

[Kevin1990]

So....(finally) tried something, i replaced the O2 sensor, just like you said, also thought the same first.....but nothing changed.

It won´t take the gas as quickly as the 3.0 normally does, i use my Saratoga for comparison.
It smells like unburned gas after a harder start, no leaks in the fuel system.

Does anybody have some ignition timing datas for me?
I´d like to try an adjustment, has never been done after the timing belt snapped....

 

[gusc]

You didn't mention the belt before?

Did this problem start right after the belt was replaced?

If so it surely was not replaced properly, an easy thing to do and will cause exactly your problem.

Your manual will give the proper procedure. The worst thing is getting to it!

 

[Kevin1990]

Well i found the car on a junkyard with snapped timing belt, i set it up right and put on a new belt and water pump.

I didn´t even now if it was running.
I checked the timing marks after a few tuns and a short drive, everything´s fine.

But i haven´t adjusted the ignitio timing yet...

 

[gusc]

Keep us informed after you set the ig timing, very curious!

 

[Kevin1990]

Yes sir!

One last thing....anybody got some settings for the ignition timing? I don´t have any information about that...


Thanks!

 

[gusc]

You need a factory manual set, lots of them on ebay at far below original price!

The info is surely available on the net, do a google search.

I'm away from home but will send it to you Fri if you don't get it sooner.

 

[Kevin1990]

Ahh.... (stupid)...found it online, thanks!

Yeah a factory manual is on it´s way, got one in nice shape, but i guess i have to wait until next week, at least...

12 degree before TD should be correct, thats what i found online.

 

[gusc]

I just now got home, glad you got the info. You also need the rpm used for timing.

You will be forever glad you have the factory manual, I have one for every machine I own - which is a bunch; too many!

 

[Kevin1990]

I just now got home, glad you got the info. You also need the rpm used for timing.

You will be forever glad you have the factory manual, I have one for every machine I own - which is a bunch; too many!

You´re so right, i know! I used my AA Body manual a hundred times or so, pure gold for the hobby mechanic!

But i guess i´m running the classic 1989 / 1990 fuel injector problem....