This weeks code is a po200, Autozone sez its got something to do with the injectors circuit or something. I just got my pcm back from Bryan Thursday--going to work that night i noticed a stumble at speed. Today i get in my car it stumbles at low speed, then it throws my ses light, then it starts to flash, then stays on steady for a short while then flashes again--took to Autozone, it had thrown two po200 codes. Would that have something to do with my computer or by chance has something else decided to act up? Where do i begin, bad gas? Gas Filter been changed. When i hooked up the computer rain water had got into the car's computer plug in- shook it out--This cam install is a pain,,Thanks for any help--Dwayne

 

Just a guess here. Have you checked your TPS voltage. My car did the same thing with the first motor when I got it running, but I also changed the throttle body. Maybe it's off. I forget the exact codes I set off. If I didn't floor it it was fine, but the min it was WOT the car sould stumble and the check engine light would come on.

 

Would a tps problem cause this? I have a 52mm tb, but have always had that. My step-son did adjust the tps a couple weeks ago, couldn't get dead on, even slotting the screw holes, but it didnt stumble or throw a code until i got my pcm back thursday and all that was done was i had Bryan lower my idle down as i told him the first time reprogram to raise it to high. Thanks Dwayne

 

P0200 is a fault in the injector circuit(s). I wouldn't start poking around in the TPS if is is showing P0200. The PCM is detecting the incorrect current flow to one or more of the injectors. Could be a bad connection on the PCM harness connector for one of the 8 injector circuit wires, bad wire to the injector, bad connection at the injector, or a faulty injector.

I'm surprised you aren't also getting a misfire code, cylinder specific. Has the SES light ever started flashing, rather than staying on constantly?

 

No sir, this is my first flashing light. So i quess i need to check my connections? You can feel the stumble pretty good. You probaly dont remember Fred but you help me on last months code--a po300 multiple cynlinder misfire-- Got an exchange pcm from Bryan,made the mistake of having my idle in gear at 900rpms, so i sent it back to him to get it lowered, got it back thursday,and that day is when my stumble started--saturday is when i started my ses light on steady then my flashing ses light--thanks Dwayne

 

Well today i pulled out the pcm, looked over the pcm connections, reinstalled, drove around for about 15 minutes or so, it started stumbling again and the ses light came on then started to flash again-just like yesterday, was hoping for a bad connection at the pcm, i didnt get the code pulled today, fiqured it was the po200 code again--This is one of those it didnt do it before the reprogram type deals--like i stated before i just had Bryan lower my idle down, hook it up and i got this now--Bad computer or just something that was fixing to happen anyway?? Thanks Dwayne

 

I hate to TTT this again, but would my computer cause this? Leaning that way since it happen the first time since i got the pcm back--I have e-mailed PCMFORLESS--Dwayne

 

TTT Please

 

Did they get any codes beside the P0200? If your SES light flashes, it is usually an indication of a misfire, which would also set a code, and that would stay "stored" along with the total misfire count for the cylinder . Have you ever had it scanned by anyone other than the same AutoZone? Do you feel they are competent?

Have you checked the individual injector connections... not just the PCM connectors? Have you checked the grounds on the PCM and engine?

Have you asked pcmforless for some feedback?

Just curious..... you don't seen to be doing too much, other than typing "ttt".......

 

Well all of us arent "Injuneers", but yeah i have had feedback from my programmer and he said when he gets a core he would send me one, but i thought i could save him the trouble, if i could get some help from the experienced people here, but i cant get it , It didnt happen before the computer change, didnt move anything else so i wait days before the TTT-- Thanks Fred i got your back

 

Hey, I'm hoping someone can solve this problem as well. I just got done with my LT4 Hotcam install, new plugs and wires, and am getting the PO300 code. I'm hoping the car just needs a program but if it isn't that then it could be about anything. Opti would be my first guess but I hope not.

 

I'm having the same problem with the misfire and blinking SES light.

So far....
Got another opti from a friend that was "supposed" to be good (no change in symptoms after swap)

New distributor cap/rotor

verified the plug is getting fire

2 new plugs in same hole (#1, BTW is the only one that WONT fire)

got a used injector from local F-Body salvage yard (again, no cgange in symptom)

vaccum is ~17psi @ idle (ported heads, cc304 cam)

checked compression on #1 to be over 110lbs by bumping the key (went damn near 200lbs by letting it 'whirl over' several rounds)

pulled injector connectors one at a time, no change with #1 off, others cause a drop off in idle

#1 plug is always wet with fuel

went to AutoZone and got a MAF, injector circut (2 of them), and bank 2 O2 codes

There may be something else i'm leaving out that i've done to try to get #1 to run. If you have any more specific questions about what i've done so far just ask and i'll be glad to get real specific.

This darn thing is starting to get depressing! Can anyone offer suggestions please! Thanks
Graham

 

TTGDT

 

My problem was a false code. The OBDII computer is sensitive to a cam change so the PCM had to be programmed to get rid of the code. It sounds like your problem is a little more serious. I would keep checking ignition components. It can only be ignition if you arn't getting spark. Sorry I cant help more.

Scott

 

lol, thats what sucks about my situation. I'm getting fuel, fire, and compression.

I think today or tomorrow i'm gonna try to prove whether the spark/injector fire are occouring at the right time in #1.

Im gonna borrow another PCM in the morning too.