Just bought a 2007 Tahoe LTZ, have a few ?'s

[a_kraker99]

I look forward to contributing to this forum once I get to know the Tahoe a bit better. Feel free to answer any of my questions below. Thanks!

1. Tahoe has 120k on it and never ran E85. I hear you can run a tank through to clean out the fuel system? Is that going to clog stuff up like the fuel injectors since it never ran it before?

2. I have a cylinder 3 random misfire at idle while monitoring with OBD. Changed spark plugs and swapped wires with another plug but still have it on. Possibly the beginning of a bad coil?

3. Tune or programmer recommendation?

4. One of my door handles seems to be broke off a little. Any write ups on how to fix or replace it?

5. I am getting a some knock retard. Up to 4 degrees while accelerating. Is that normal or what might be causing it?

 

[NathanJax]

I moved your thread to the 07+ area instead of the 00-06.

 

[a_kraker99]

Thanks, sorry

 

[NautiKev]

I look forward to contributing to this forum once I get to know the Tahoe a bit better. Feel free to answer any of my questions below. Thanks!

1. Tahoe has 120k on it and never ran E85. I hear you can run a tank through to clean out the fuel system? Is that going to clog stuff up like the fuel injectors since it never ran it before?

2. I have a cylinder 3 random misfire at idle while monitoring with OBD. Changed spark plugs and swapped wires with another plug but still have it on. Possibly the beginning of a bad coil?

3. Tune or programmer recommendation?

4. One of my door handles seems to be broke off a little. Any write ups on how to fix or replace it?

5. I am getting a some knock retard. Up to 4 degrees while accelerating. Is that normal or what might be causing it?

1. I wouldn't waste your money!
2. Switch the coil out with another and see if the skip goes to the other cyl. if it does you got a bad coil. Most likely your problem anyway.
3. BB Tune, everyone here will say the same. don't waste your money on a box tuner. BB is the real deal.
4. Not sure......
5. Probably has to do with bad gas or your cyl misfire.

 

[a_kraker99]

Thanks, I have heard the Black Bear recommendation before. I will probably go with that.

 

[a_kraker99]

Another question. Does this engine have a serviceable PCV system? if so where is the valve?

 

[a_kraker99]

Okay I swapped the coil and wires but I still get a misfire at idle on 3. Clogged injector maybe?

 

[NautiKev]

Okay I swapped the coil and wires but I still get a misfire at idle on 3. Clogged injector maybe?

sounds correct unless you have burnt valve, or the valve guides are sticking.

How long has the truck had a misfire problem?

 

[a_kraker99]

sounds correct unless you have burnt valve, or the valve guides are sticking.

How long has the truck had a misfire problem?

I just got it. I don't think I would call it a problem yet. Just me being picky. It misfires only at idle probably 4 times every 10 seconds.

 

[Goodinblack]

It misfires and there is no codes?

 

[a_kraker99]

yeah, it probably isn't enough to trip a code. I am just monitoring it with my scanner.

 

[a_kraker99]

The odd thing is that I don't think it was misfiring before I ran a can of Techron through the system. I wonder if the Techron knocked some crud off in the fuel tank or lines and clogged up ones of my injectors.

 

[PlazaEJ]

If it was small enough to get passed the fuel filter, I wouldn't think it would clog an injector.

My suggestion, try cleaning your MAF. Cheap, easy, and if doesn't completely cure your ills, nothing hurt.

EJ

 

[a_kraker99]

Yeah, if it was a random misfire on all cylinders I could see that. I planned on doing a MAF and throttle body cleaning soon anyway. Is there any procedure for relearning idle after cleaning the throttle body?

 

[PlazaEJ]

Yeah, if it was a random misfire on all cylinders I could see that. I planned on doing a MAF and throttle body cleaning soon anyway. Is there any procedure for relearning idle after cleaning the throttle body?

Nope. Just drive like normal.

 

[a_kraker99]

cleaned the throttle body and MAF and it didn't seem to help. I noticed that the misfire is much worse while the engine is cold. Once it warms up I get around 1 misfire every 5 seconds or so. My idle seems a little rough though even when misfires don't show up.