7747 running issues

**kacy** · 01-05-2017

Since i know nothing of this trucks history is there a chance that this engine could have come from a car with a roller cam and is why it is running lean?

**mmigacz** · 01-05-2017

Originally Posted by mmigacz

Here is my advise.. Determine if the ecm has the chip adapter that allows it to use a 27SF512 chip. If it does, buy a chip burner (moates has them for $85)... After getting the burner/reader, download the actual bin file from your chip. You will need this when you do your vortec modifications. If you don't have the 27SF512 adapter (or don't know what I am referring to). post your answer and I can get you different directions.

Did you give any thought to this? You can start trying some of the suggestions from others. Also, you will need to learn how to tune (change bin files) when the vortec mods are made.

**kacy** · 01-05-2017

I looked it doesnt have the 24 to 28 pin adapter, I haven't looked into getting the adapter and new chips/ burner. I was hoping to get this issue corrected or identified before i went and changed other stuff.

**kacy** · 01-06-2017

Originally Posted by mmigacz

Did you give any thought to this? You can start trying some of the suggestions from others. Also, you will need to learn how to tune (change bin files) when the vortec mods are made.

Is this the correct device you are refering to?

**mmigacz** · 01-06-2017

Originally Posted by kacy

Is this the correct device you are refering to?

It looks like it. Mine doesn't have a wire hanging off of it. Make sure it says G2 memory adapter (.06" leg spacing) when you buy it.

**lionelhutz** · 01-06-2017

Maybe I missed it but does your engine have any exhaust modifications? A non-heated O2 sensor tends to do poorly if it's not installed right in the exhaust manifold.

**kacy** · 01-06-2017

Originally Posted by lionelhutz

Maybe I missed it but does your engine have any exhaust modifications? A non-heated O2 sensor tends to do poorly if it's not installed right in the exhaust manifold.

Factory manifolds, true duals no cat pipes violator mufflers

**mmigacz** · 01-06-2017

Originally Posted by kacy

Is this the correct device you are refering to?

That picture is not of the G2 adapter, its a 2timer. This is not what you need.

**kacy** · 01-10-2017

Originally Posted by mmigacz

That picture is not of the G2 adapter, its a 2timer. This is not what you need.

This from the link you used earlier in this post, this looks to tall to put the lid back on.

**kacy** · 01-10-2017

Originally Posted by jim_in_dorris

Looking at your symptoms, you either have a vacuum leak, a pre- o2 sensor exhaust leak, or incorrect injectors would be my guess. Try smoking or if you don't have a smoke gun, propane can help locate a vacuum leak. Also, verify your injectors by looking at the numbers stamped on them

If it were a vacuum leak wouldnt the IAC have lower than normal counts to compensate for the leak or a high idle if IAC cant compensate enough? Exhaust leak is a possibility i tried to get it to seal to the manifold hard to tell and without sliding under there with a bottle of soap and water if its a little one. Injectors is a possibility that I have considered just havent check yet as the truck is getting a shift kit installed for towing after I get these issues resolved.

**mmigacz** · 01-10-2017

I leave my lid off (since I'm swapping chips a lot). However, you can space the lid up with weather stripping to make clearance, if you are concerned with dust getting in. Also, that picture shows them using a spacer before the G2 adapter. You can omit the spacer and solder the G2 adapter directly to the circuit board. If you read the tutorial on moates they mention this.

**kacy** · 01-10-2017

sorry for all the questions, but are these chips reflashable or are they a one and done deal?

**mmigacz** · 01-10-2017

Originally Posted by kacy

sorry for all the questions, but are these chips reflashable or are they a one and done deal?

That's all right. I had my share of questions when I started... Yes, the 27SF512 chips are reflashable. For a starting point, I would buy (2). One for the ecm and one for changes.

**kacy** · 01-14-2017

Picked up an ASDU chip from pic a part yard, now shows 142 itn and 170 blm at idle using same adx and xdf, in the process i think I knocked a vacuum line for hvac off as I cant get air to blow from defrost or hot air.

**mmigacz** · 01-14-2017

sounds like you need to get that vacuum leak found. Somebody suggested getting a heated o2 sensor, did you try that too? Post the data log, I'm curious if the O2 swings are still on the lean side. Is egr connected?