New engine in, but "check engine" light on and stabilitrac on

[BobM]

My '07 Tahoe lost two cylinders. I had the DOD deleted 150XXX ago and it has a cat back and CAI. I found an aluminum block AFM deleted engine with ~114K on it. The engine has an AMS Racing cam and lifters in it. I had a guy install it for me (I've had a heart attack and a stent and am now over 70.). Engine runs good, sounds great with my new cat back (The old one was about rusted out.), but the "check engine light is on and the "service stabilitrac" light comes on. The only other things done were I had new plugs/wires and a set of cheap Amazon injectors installed.
I had a local shop check it out. The shop was po'ed that I didn't pay them thousands to replace the engine and was kinda snarky. After $145 all I got out of them was that it is throwing PO3, PO175 and PO172 codes. They said that, since they didn't put the engine in that they could do no more. They put on the diagnoses that they suspect it "may have wrong engine and or/ components".
The original engine started having an intermittent misfire and then suddenly dropped two cylinders. I assumed that meant that a couple of the DOD lifters had failed. So, this engine came up for sale at the same time and I pounced on it cause I could buy it for what a delete kit would cost me. When the guy put the engine in and started to spin it over to prime the new Melling oil pump, it wouldn't build pressure. He pulled the oil pan and found they had cracked the oil pickup tube. We used the tube off the old engine and it has worked fine. My guy suspects that's why they sold the engine because they couldn't figure why there was no oil pressure.
I haven't pulled my old engine apart (Heart attack.) to see if it was just the lifters. I drove the old engine about 30 miles on 6 cylinders to have the engine replaced. The "check engine" light and "service stabilitrac" lights came on then. I didn't question that since it was only running on six cylinders. But now it still has the lights on and, after I run about 10 miles, the "service stabilitrac" will come on.
Any help from anybody?

 

[mikez71]

Sounds like the lights came on before the engine swap? Did the shop clear the codes after checking them?

Also sounds like you may need a tune? (you must already have DOD tuned out, but you have a new motor/injectors/cam)

Two of the codes are telling you bank 1 and 2 are running rich..

Code P0172 - System Too Rich: Symptoms, causes, common problems, diagnostic

What can cause the code P0172 - System Too Rich in your car? What is short or long fuel trim, common problems and repairs

www.samarins.com

 

[mattbta]

If you've got P0300 and haven't gotten a tune as mentioned above, that cam is likely causing the random misfire code.

 

[BobM]

Also the cam is listed by AMS as : GM 12689035 1-Bolt Gen IV Non-AFM delete camshaft. I believe that is just a stock camshaft and not a "Race" camshaft.

 

[BobM]

If you've got P0300 and haven't gotten a tune as mentioned above, that cam is likely causing the random misfire code.

That's what I THOUGHT the shop was going to do. But he said that he wasn't going to do anything like that. How do I get it tuned?

 

[mattbta]

Oh, if it is a factory grind that shouldn't cause problems.

 

[BobM]

Oh, if it is a factory grind that shouldn't cause problems.

I know nothing about cams OR tunes. (I'm OLD remember ) But I'm willing to learn. And the cam is what I was told by the PO (The one who couldn't figure out why no oil pressure!)

 

[BobM]

Sounds like the lights came on before the engine swap? Did the shop clear the codes after checking them?

Also sounds like you may need a tune? (you must already have DOD tuned out, but you have a new motor/injectors/cam)

Two of the codes are telling you bank 1 and 2 are running rich..

Code P0172 - System Too Rich: Symptoms, causes, common problems, diagnostic

What can cause the code P0172 - System Too Rich in your car? What is short or long fuel trim, common problems and repairs

www.samarins.com

Yes the lights came on as I drove it on six cylinders about 30 miles to get it to the replacement guy. And no, the snarky shop didn't clear the codes. But I'm guessing they are still coming on as the "service stabilitrac" keeps coming on and then comes on again and again and... :-(

 

[j91z28d1]

if you have never had afm disabled in your ecm and delete it mechanically it won't run right.

you need to either have black bear here tune it, have hptuners and disable it, or if you can there's a place you can mail the ecm off and have it done for about 50$. the other way are much more expensive, but you won't have the down time.

 

[mikez71]

You should get a scanner for checking/clearing codes. That way you won't have to deal with the shops.
I don't know which one to recommend, but even a cheap one (less than what you paid the shop) will let you check and clear the basic codes..

 

[BobM]

if you have never had afm disabled in your ecm and delete it mechanically it won't run right.

you need to either have black bear here tune it, have hptuners and disable it, or if you can there's a place you can mail the ecm off and have it done for about 50$. the other way are much more expensive, but you won't have the down time.

No, the snarky shop tuned the ecm years ago to delete the afm. It has run at least 150k since then with no problems. I just assumed that, since they were the ones that tuned the ecm the first time, that I should have them tune it now. They won't since they weren't paid to replace the engine.

 

[j91z28d1]

No, the snarky shop tuned the ecm years ago to delete the afm. It has run at least 150k since then with no problems. I just assumed that, since they were the ones that tuned the ecm the first time, that I should have them tune it now. They won't since they weren't paid to replace the engine.

ahh if they turned it off in the tune before it's still off and nothing needs redone unless you changed out the computer during the swap. tuning for the cam itself, I was thinking you bought a cam to increase performance, like say a stage one or 2 type deal. if it's just a standard stock gm cam without afm I'm guessing they part is OK.


just to be clear your shop had to be one that had a tuning software like hptuners or the like. Just a standard obd2 scanner that a normal repair shop have won't disable afm in the tune.


do you have access to the old engine? I personally would start with checking out that engine for damage.

let me look at those P codes they gave you. hold on.

 

[j91z28d1]

looks like. 175 and. 172 are rich bank 1 and 2.

that could be so many things, probably what's causing the p0300 which is miss fire code.

what do you know about those Amazon injectors? my guess is they aren't the right size or are just cheap. if the old ones test good, might try putting them back on.

do you have any kind of scanner that can show data?

 

[BobM]

looks like. 175 and. 172 are rich bank 1 and 2.

that could be so many things, probably what's causing the p0300 which is miss fire code.

what do you know about those Amazon injectors? my guess is they aren't the right size or are just cheap. if the old ones test good, might try putting them back on.

do you have any kind of scanner that can show data?

Looks like I may have someone to tune it. My son has a buddy that has a dyno in his shop and does tunes. He may be persuaded to look it over for me. Here's hoping.

 

[j91z28d1]

let us know how it goes.. oh yeah miss fire code that set will. also cause the stability control to throw the warning because it can't work correctly when the engine is missing.

likely from being rich, I have hopes the shop that tunes can see why it's throwing rich codes. should have more experience with stuff like that

 

[Fless]

Two threads going, so I'm locking this one.

See the other one here: https://www.tahoeyukonforum.com/threads/got-an-engine-now-gremlins.149812/