1st gen studder issues.

[jaypeterson]

Well i think i have made the dsm god mad at me since 2 of my dsms dont run right.

Well this one is a 92 awd 5 speed. has brand new t belt.. (timing excellent) new HKS metal head gasket , and awesome compression. I have replaced the ecu the mass air, and the coils, plugs and wires. The car idles fine. but when the gas is given the car will usually fall on its fase and studder. and miss.. it will even do it when just cruzin down the hiway at a constant speed. the car will seem to die then you play with the throttle and it cruzes fine again for a few minutes.. Now the one main thing i notice is my o2 doesent cycle... it stays rich.. even at idle. the check engine light is on. I havent had a chance to get the code yet..

But would a bad o2 cause this? i think i have covered everything else with the car. Turbo is a brand new mitsu big 16g. and has a edlebrock afpr running 43 psi.. I know the tps is working fine as i have a safc and i can see it reads 100% at wot. and 0% at idle.. let me know what u guys think... this kinda stuff makes me not want to own 2 dsms...

 

[gsxboost20g]

I have some experience working on my bro's 90 gsx, when you did the coils,, did you do anything with the ignitor pack? that controls the coils..... How about the computer, you changed it? are you absolutely sure you replaced it with a unit that matches your vehicle exactly? as there are many variations in part numbers, or what people claim to work in a given vehicle. Oh, does your tach bounce around randomly when the issue occurs? that can narrow down your search...

 

[jaypeterson]

no the tach stays perfict when it does it... I some what think its air fuel ratio sice if i go anything + or - on the safc from the stock setting it get alot worse.. i did replace the uce with a 91 turbo 5 speed. and its was a know worker... same as tthe coil i tested it on another car before i installed it.the mass air was a tried and tested too.. the plug wires are brand new. as well as plugs. I have a new o2 comming so hopefully that will fix it.

I tryed disconecting the o2 and the gauge goes right to lean, when i hoook iot back up it goes right to rich...

Can someone tell me what will happen on there 1g when they disconect the o2 sensor. and if they have a o2 gauge what does it read? thanks.

 

[Maximuscr31]

Do you have a narrowband a/f guage? Do you have a actual logger?

 

[jaypeterson]

o i just have one of the useless narrow band gauges... but it just stays right on rich,doesent ever cycle back and fourth. like it should. but when the o2 is disconected it goes to lean.. which makes me think the o2 is bad, how do these cars act with a non functioning o2 sensor?