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very common mistake on hotrods.

When you have this problem and there is no maf on the car it gets super pissed when you try to crank it after a battery disconnect.

I use a template to setup GEN 3-4 in SD. If someone has a...

That's right.. That's why most experienced tuners don't mess much with AFR.

It could be on Propane and if lambda = 1 than it is stoich.

IF you do the basic diag, plug wires, plugs, etc. You can try moving injectors to see if the miss follows. If all the basics check out than it will point to a cam with some wiped lobes.

Post a log. Include some wide open throttle data in the log.

It's going to need VVE tuning.

No fuel trims, looks very rich. Your going to be fighting that trying to make it idle.

You would need GM reprogramming software to try this. HPTuners can not do that.

145174

You can see what I'm talking about here.

I tune GEN 3- 5 with this thing daily. So I try to make my scanner super dynamic. You will have better scanner performance if you only have...

I've not had that issue where a SD car wants to start with MAF in a long long time. There must be something about how I'm failing the MAF.

I'm very aware of the issue. GTO's always seemed worse...

Even though this is a PFI motor it should really go in the GEN 5 section.


If this is a PD style blower magnacharger, LT4, etc. You should look into getting a SCIAP sensor on it. It will fix...

Hey Robert. There are two brake switches.. One that is normally open that runs the lights. The other is normally closed and will keep the torque converter from locking especially off the gas in...

You can make another graph tab and break up how many you have in one. Go layout - add to lay out- graphs. I have 4 separate tabs of graphs on mine.

Looks like VVT was deleted? If so the cam tables need to be zeroed out and the VVE modifiers for camshaft movement need to be zeroed out.

The VVE and the timing are a mess.

Thats going to be a hard job for a new person.

You'll want to read up on speed density tuning VVE with this cam. Might not be a bad idea to get a start up tune from a seasoned tuner.

You should stop working with AFR. Switch to EQ ratio

All O2 sensors, narrrow band or wideband are looking for a stoich burn. They don't actually report back 14.1/1 etc.

A well tuned E85 car...

Dynamic airflow doesn?t equal VE airflow. You can log a gen 4 where VE airflow can be logged and see this.

You got the idea that the tuner left him cold. His replies do not give me that...

You are likely going to take this as an attack. Please don't. I don't intend it to be. Perhaps you could look at it with a different point of view.


12% fuel trims... They are STFT. Could be...

It's definately related to camshaft position sensor.

Some won't throw a code but have a problem.

Stock cam C5 Z06's were bad about cam sprocket bolts backing out (seriously) and that would...

LPE makes a box that works well for this.

good catch.

That is the issue. You can't put them pre turbo? Unless its a full out race setup the 02's will be OK with the heat.

"calling yourself a professional tuner you should be doing the job correctly " This is the issue.. There isn't a 100% correct way / standardized way of doing this. What is correct to me might not...

You did do a WRITE ENTIRE when you applied the TCS patch?

There may be another code pending.

The GTO's are the only ones from memory that need that TCS speed density patch even though its...

the o2's look healthy but the fuel trims are split big time.

I suspect the right o2 sensor has been plugged into the left sensor spot on the harness. It happens way more often than you'd expect....

This looks much much better than average for a paid tune. Power is reasonable especially for being in a CTSV

I can't vouch for everything because there is no standardized approach to this stuff...