Printable Version of Topic

Posted by: marc_hines Sep 5 2004, 09:27 PM

I changed the oil on my 75 2.0 teener today. The last time I changed oil on a type IV engine I was 17 (I had a 75 bus back then) - I'm 43 now and the dealerships have been doing all maintnence on my vehicles since then.

It all came back to me - wasn't hard at all. No leaks, either.

So, flush with this success, I was driving about and noticed that the idle gets slower and slower as the engines warms up. It's get down to about 500 r.p.m. - that's a bit rougher than I like.

So, I figure - Mr. Mechanic (carefully concealed as a software engineer) that I would adjust the idle.

Right. I should have remeberd the software engineers mantra - that's a hardware problem.

My 2.0 has the L-jet FI. The idle is adjusted by moving the clampon the trottle cable end to another location. After fooling with it, giving up - then going back out and trying again, and giving up again - it seemed like the right time to ask for advice.

The snag is that if the trottle body is allowed to closed compeletly - the engine dies. So, as the htrottle cable heats up and expands, it get's longer, the idle get slower, and eventually the vehicle idles much too slow.

Since I 'Adjusted' it, well, I have made it worse.

Any ideas how I can get this idling right?

Thanks in advance!

Marc...

Posted by: Ctrout Sep 5 2004, 09:31 PM

I thought that the idle speed on an L-Jet equipped engine was adjusted by the screw on the throttle body itself. I could be (and probably am) wrong though.

Posted by: qa1142 Sep 5 2004, 09:58 PM

Check Oil fill cap. Any vacuum leak there will cause your idle to be funky.

FYI, my 1974 1.8L idle slowly goes up till it is at 1100-1200 when hot, and I still cannot figure it out either.

Posted by: marc_hines Sep 6 2004, 10:09 AM

I forgot about the other side of the throttle body - I will look for and adjustment screw there - thanks.

Also, I found yesterday the whole oil-filler cap assembly is loose - so I know I've got that to fix.

I will pull off the air cleaner and see what else may be messed up.

Don't you just love 30 year old cars?

Marc...

Posted by: Levi Sep 6 2004, 10:18 AM

Fix the filler cap box 1st, you might find that this alone could fix you problem...