universal exhaust on 85 4kq question

[Ameer Antar]

actually i think I saw it show up today, but not sure. Welcome to the 
wonderful world of CIS. Answers are hard to find, and there is a lot of 
mis-information out there. Sounds like your mixture is either leaning out 
or going too rich. Either one will give sluggish response. On my 5kT, I 
hooked up an air-fuel ratio gauge to the O2 sensor so that I could see what 
was going on. I don't think I could drive the car w/o it now. I found out 
exactly what was happening at different conditions, which is impossible to 
tell w/o it. You can get one for $50 from most distributers. This will tell 
you what's happening on those hot days when the fuel is not correct.

But w/o this gadget, make sure the air-flow sensor moves freely and evenly. 
check for vacc. leaks very carefully, esp. where the clamps are which is 
where the most stress is. Also make sure the cooling system is ok. The 
engine will run poorly if too cold or to hot. The temp should be right in 
the middle. Testing the fuel pressure w/ a kit from JC Whitney [$55] will 
also pinpoint problems in the fuel system. Just some thoughts...


At 12:15 AM 9/11/00 -0400, you wrote:

>Hello.
>i am new to the Q list and may not be using it correctly. i listed this 
>message a while ago and have not seen any response. perhaps you can speak 
>to it. also could you tell me if you did or did not see this posted 
>earlier? thanks,
>
>Peter
>
>'87 5kcstq 190k
>
>my 5000 hesitates during acceleration when the outside air temperature is 
>65º Ÿ or above(once the engine is warmed up). on a cool or cold day, there 
>is no hesitation no matter how warm the engine is. i think that the air 
>flow sensor plate is dropping and wonder if i can test this by securing it 
>in the upward position. if it is the plate, why? also, can anyone think of 
>what else may be causing this? thanks...