Hi,

 

I recently got an 86 gl-10. I put 2000 miles on it no problem. Lately, it started this thing after it warms up it starts chugging. Violently sometimes. After a while it stalls. If I let it sit for a few it'll drive for a while before starting its chugging again. I've ruled out fuel pump/filters. Are there any other parts I might change? Gentle I'm a noob. Thanks.

How did you rule out fuel pump/filters?

 

Carbed or injected?

My friend I bought it from said he just changed the fuel pump, which I guess doesn't rule it out but it only chugs after I've driven 30-40 mi. And I changed filters. Its injected-turbo-1.8

This is a bit off the wall, but my '85 EA82T that had intermittent chugging/stalling. Sometimes it was great, other times it wasn't and would chug and stall once warm. Rolling into the throttle resulted in very non-linear acceleration too ... until the revs came up.

 

Measured AFM voltage while opening the flapper door and it would jump around quite a bit on its journey from 0 to 5v. It was mostly noisy in the lower end of the range where the flapper spends most of its time.

 

I took the AFM apart (dug into the electronic part by prying the plastic lid off) and used a cotton swab, a piece of paper, and some isopropyl alcohol to clean the wiper arm, carbon strip, and upper wiper arm contact (the fulcrum it pivots on is an electrical connection) and I got a lot of dust and carbon buildup (the strip wears) out of there. Car runs very very smooth now. AFM voltage is perfectly smooth as the flapper door opens.

 

If that turns out to be your problem, this page will be helpful:

http://www.clarks-garage.com/shop-manual/elect-22.htm

Sounds like it might be running lean.

 

I would unplug the coolant temperature sensor while the engine is in a bad mood.If it improves,it may or may not indicate a faulty sensor.(probably not)

 

Fuel pressure test too.

Check for leaky intake manifold gaskets.

Thanks for the input fellas.-ian

My 85 did that . It was carbed and sucking oil out of a bad PCV.

Had an 85 XT turbo once. Similar problem. Problem in my case was a poor electrical connection. Look for a grounding wire on one of the intake manifold bolts, passenger side. Also have a good AFM for this model. Removed from an engine with 60k miles and stored for many years. $50 plus shipping if interested.

Changed the PCV valve......that did the trick! Thanks guys.

Good deal. Thanks for the update.