[Turboturtle6.5]

Are you talking the optical sensor or the cps?

The optical sensor. (The jumper wire with the noise reducer in it) 1 end plugs into the engine harness and the other end plugs into the optical sensor. Take that section out and plug the engine harness directly into the optical sensor. Both times I had this issue I had the same codes and the same problems

 

[Hammy229]

The optical sensor. (The jumper wire with the noise reducer in it) 1 end plugs into the engine harness and the other end plugs into the optical sensor. Take that section out and plug the engine harness directly into the optical sensor. Both times I had this issue I had the same codes and the same problems

Thanks for the tip I will try that tomorrow and see what happens. I was curious as to what that little jumper was for

 

[Turboturtle6.5]

Thanks for the tip I will try that tomorrow and see what happens. I was curious as to what that little jumper was for

It’s a “noise” reducer supposedly made to reduce electronic interference between the IP and the computer. I have driven over a 100,000 miles without it and never had a issue

 

[Turboturtle6.5]

Thanks for the tip I will try that tomorrow and see what happens. I was curious as to what that little jumper was for

If this doesn’t work reach out to me and I’ll see if I can help you. I have plenty of experience with these trucks personally and professionally

 

[Hammy229]

If this doesn’t work reach out to me and I’ll see if I can help you. I have plenty of experience with these trucks personally and professionally

Thank you! Will do!

 

[OkDually]

It’s a “noise” reducer supposedly made to reduce electronic interference between the IP and the computer. I have driven over a 100,000 miles without it and never had a issue

For reference, this is what the filter looks like.

If you follow the wires from the top of the Optical Sensor down you'll see the filter ( if equipped. It may have been removed already by a previous owner or never had it.)
If you find it then disconnect it from the harness and make sure everything else is plugged back in. Then throw away the filter. It is well know to cause performance issues

 

[Hammy229]

Well I'm still weirded out. I unplugged the extention harness to the optical sensor and the the truck.would rum but not idle ....so I unplugged the cps and truck started and is currently idling great. So I plugged the cps back in and no change in idel ....only thing is I still have delayed throttle when in gear ....its better than before...and it startes to build rpm but it is very delayed......im going on a quick test drive in hopes I can make it home to see how it acts .
Only code now is dtc 19 from.me unplugging the cps then plugging it back in

 

[OkDually]

Well I'm still weirded out. I unplugged the extention harness to the optical sensor and the the truck.would rum but not idle ....so I unplugged the cps and truck started and is currently idling great. So I plugged the cps back in and no change in idel ....only thing is I still have delayed throttle when in gear ....its better than before...and it startes to build rpm but it is very delayed......im going on a quick test drive in hopes I can make it home to see how it acts .
Only code now is dtc 19 from.me unplugging the cps then plugging it back in

I would change out that CPS ( AC/Delco brand)

 

[Hammy229]

I would change out that CPS ( AC/Delco brand)

Yeah I couldn't find one on short notice but I think I'll go to the local chevy dealer that's about the only place I can think to find one. The truck seemed ro run fine other than it seems to lack some of the power it had before ...and I have a slight white haze fron the tail pipe like it's unburnt fuel ...could this mean my pump needing to be turned one way or the other.

Also if it ain't one thing it's another, yep those are starter bolts ...thank God the block didn't crack just the stud for the bracket, and yes I did have my bracket on . I believe just from all the cranking lately the bolts just got loose enough for it to move around. But the good news is the broken pieces came out easy.

 

[OkDually]

You may have to order it online. Try searching eBay for NOS CPS

 

[Hammy229]

You may have to order it online. Try searching eBay for NOS CPS

I'll give that a try thanks!

 

[OkDually]

You might also check Rock Auto for the OEM starter bolts

 

[Turboturtle6.5]

I'll give that a try thanks!

It sounds to me like besides from needing new starter bolts now you just need to properly set the pump timing. Do you have the gmtd software and cable?

 

[Hammy229]

It sounds to me like besides from needing new starter bolts now you just need to properly set the pump timing. Do you have the gmtd software and cable?

No I do not. I did a little bit of research about one but haven't gotten that far yet

 

[Turboturtle6.5]

No I do not. I did a little bit of research about one but haven't gotten that far yet

i have a tech 2 now but 1 of my old laptops has the gmtd software. If you need it I can send it to you. You would just have to buy the usb to obd1 cable

 

[Hammy229]

i have a tech 2 now but 1 of my old laptops has the gmtd software. If you need it I can send it to you. You would just have to buy the usb to obd1 cable

My wife has a laptop that will work I will just have to find a cable and get the software.
Is the best place to get it the engh guys? Also any good places to get a cable ...will any USB to obd1 cable work?

 

[Hammy229]

My batteries are not happy with me after all the cranking here lately...after charging most the day yesterday and today they finally held up enough. So the symptoms now are with the cps plugged in the truck will white smoke like crazy with erattic idel ...with it unplugged it takes longer to start (obviously) but once start it runs fine. Now I know I need to do the tdco relearn regardless but I guess my question is will that solve the issue or could my "new" cps be bad . I have a Ntk one on order and I'm still looking for an acdelco one but they seem hard to find

 

[Turboturtle6.5]

My wife has a laptop that will work I will just have to find a cable and get the software.
Is the best place to get it the engh guys? Also any good places to get a cable ...will any USB to obd1 cable work?

most people buy The software fromhttps://gmtdscan.com// as for the cable anyone should work…I bought mine on eBay

 

[quadstar87]

@Hammy229 Scott, sorry for the miscommunication. We are trying our best and even hired more help this year but mistakes will happen.

I've used your email as a learning opportunity this morning and we talked it over here to make sure everyone knows how to answer differently next time.

Quadstar is not all the hype you think he is.... 5288 was superseded by the 5521 which is the basic standard for quite some years. If it don't run right get rid of it. But a good 5288 will run as good as a 5521. No reputable dealer would build one to 5288 specs as newer improved parts are in the 5521.

Nice to see you are still on your high horse, never make mistakes, and still don't have the cahones to tag us. My tech mis-read 5288 vs 5068 in the hundreds of emails we get on a daily basis. He tried to help someone here who wasn't even a customer in our system. He also advised him on how to remove the stuck crank sensor.

 

[DieselPro]

Nice to see you are still on your high horse, never make mistakes, and still don't have the cahones to tag us.

Perhaps you would like to explain this quote. Quite vulgar for a reputable shop, So tag your it!