Please help car running horrible

[85tr]

Long story but I put a stock rebuilt engine in my car last October with the stock hotair ECM and stock injectors and it ran great. Bought some (009) injectors off the board a 87 ECM and maf and a tt chip for 42 lb 009's. The car ran fine other than at full throttle because the injectors I bought were 30lbs not the 42's I had the chip burnt for.
I bought some 42lb injectors off the board and made sure they were the right injectors this time put them in and the car runs like its only firing on 4-5 cylinders at idle and cruise there is no power. Spent the last three days going over wiring and rechecking for vac leaks with no luck. Any other ideas would be great thanks.

Some info from the powerlogger at idle.

ECM afr 12.9
Maf 7.3
Lv8. 42
Iac. 0
Rpm 925
Advance 27.9
Injector pw 2.73
Injector duty 2.1
Blm. 118
Tps. .42

I've tried setting the iac but it always makes its way back to 0.

 

[Ttype6]

I've tried setting the iac but it always makes its way back to 0.

If you want the IAC number to rise,you have to close the throttle blade more,then reset the TPS.

 

[Ttype6]

You could remove the locking clips on the injector plugs,start the car,pull off and put back on each injector plug one at a time. If,when you disconnect an injector plug,the motor doesn't slow down or display a notable change you could suspect that injector.

 

[85tr]

I'll give it a shot again but when I tried i could get it close to 30-40 but then it would slowly drop to 0 or jump way up to like 90. Would the iac cause it to run horrible all over the rpm/ load range or just idle? Thanks .

 

[85tr]

Pulled the plugs and it is running pig rich I also checked the volts at the ccci and they were 13.2 on both power wires. Checked the ohms on the ignition and saw 12 on all .

 

[85tr]

Have 2 brand new 02's one Bosch one denso tried both , no difference.

 

[85tr]

I'll give the injector harness idea a try thanks.

 

[Ttype6]

Would the iac cause it to run horrible all over the rpm/ load range or just idle? Thanks .

The IAC doesn't cause it to run good or bad. It is use by the computer to control Idle speed.

I=Idle
A=Air
C=Control
Valve

Simply close the throttle valve a little at a time and watch the numbers rise. Then re-set the TPS. If you close the throttle as much as you can and still see zero,you have a vacuum leak.
Dis you have trouble setting it when it ran good?

 

[85tr]

All the plugs looked the same covered in soot , if I had just one injector stuck open wouldn't one plug look different than the others ?

 

[Ttype6]

Re-setting the chip is always worth trying. The stock MAF is a gamble. If nothing else works,I would put the 30s back in to see if it runs good again. If it does,that would incriminate the injectors. If we find out that these injectors are bad,I have a set. Ive heard it said that injectors that sit can cause problems. I've never tested this. If it comes down to bad injectors and you want to buy mine,I'll put them in my car before I send them,as they have been in a drawer for many years.

 

[Ttype6]

All the plugs looked the same covered in soot , if I had just one injector stuck open wouldn't one plug look different than the others ?

Yes, I suspect the MAF

 

[85tr]

I was able to set the iac without a problem before doing the injector and chip swap.

 

[Ttype6]

I was able to set the iac without a problem before doing the injector and chip swap.

You said that you put a new chip in with,what you thought were,009s. Then you said ,even though the injectors were 30s,it ran fine. You said that you didn't have this problem until you swapped the 30s for the 009s So,the problem didn't arise until you put the 009s in and that was the only thing you did at that time.Do I have this correct?

 

[85tr]

Yes I was able to run 30 lb injectors with a chip from Turbotweak that was burned for 42's and the car ran good other than full throttle which is why I pulled the injectors and ran the numbers to find they were 30's and not 42's. Bought some 42lb injectors and installed them and then the issue showed up.

 

[Ttype6]

Yes I was able to run 30 lb injectors with a chip from Turbotweak that was burned for 42's and the car ran good other than full throttle which is why I pulled the injectors and ran the numbers to find they were 30's and not 42's. Bought some 42lb injectors and installed them and then the issue showed up.

Yes I was able to run 30 lb injectors with a chip from Turbotweak that was burned for 42's and the car ran good other than full throttle which is why I pulled the injectors and ran the numbers to find they were 30's and not 42's. Bought some 42lb injectors and installed them and then the issue showed up.

Your BLM number is 118.That means that the O2 sensor is reporting a rich condition to the computer and the computer is taking away fuel. The default number there would be 128, Anything lower than 128 means the computer is taking away some fuel. I'm pretty sure that that chip is capable of removing more fuel than it is. It will remove as much as it can to get the A/F ratio to14.7/1. If it stops at 118 It must think it is there,but the plugs show otherwise. My question is,Why isn't the chip removing more fuel.

Your car acts like it has a 30lbs chip running 42lbs injectors.

In order for the car to run correctly with 30lbs injectors,the computer has to turn them on for an appropriate amount of time.
If we did nothing to the program and installed larger injectors,they would be turned on for that same duration.
Since they are bigger,more fuel would pass through them.
The motor would run richer and the computer would have to take away fuel(lower injector duty cycle) to get the A/F ratio where it needs to be.

This is what your car is acting like,however it would still run good because the necessary adjustments would be made by the computer.

Do you know what your BLM number was with the 30s?

 

[Eric Stage I]

Try to get the part number off the injectors, so we know exactly what they are. Also, if you can give me your chip#, I can look it up, to make sure it matches your injectors.
Eric

 

[85tr]

Thanks Eric the chip number is 7600 and the numbers on the injectors are d3181aa and on the other side of the injector 621031. Thanks for the help guys .

 

[85tr]

Cam sensor ? Anyone ? Should I unplug it after I start the car to see if there's a difference . Thanks.

 

[Ttype6]

Cam sensor ? Anyone ? Should I unplug it after I start the car to see if there's a difference . Thanks.

Sure,couldn't hurt.
You car didn't run bad until you put the 009s in.
I would put the 30s back in.

 

[85tr]

I'm going to try the cam sensor and if that isn't it I'm going to put all the stock hotair stuff back on , it ran great with the stock electronics. I'm still having a hard time with why it ran so well at idle and cruise with 30 lb injectors and a chip burnt for 42's. Thanks for all the help I really appreciate it. It's hard to stay motivated sometimes and tips from the board sure help.