Went to the track today. During the first run, my 2001 automatic coupe, bogged down while trying to shift into 3rd. It finally shifted then took off like a rocket again. Ran a 12.701 @ 116.92 mph.
While I'm slowing down, the Check Engine light starts flashing, then it goes out after a bit. Hmmm. I head back, cool down for a bit. Talk to a friend. He tells me he saw me bog down and a puff of black smoke come out of the exhaust. We figure I must be running rich.

I run my window switch at 3200 and 5800 rpms. So, I change it to 5600 rpms, hoping I won't have as much trouble shifting.

Second run. Bog down a little bit but not as much. Much smoother though. Run a 12.696 @ 116.12 mph. Check engine light flashes again, and then stays on. This time it won't go off.

I shut it off for the day. Another friend pulls my PCM fuse for a minute or two and then puts it back in. I start it again, and still a check engine light.

I run it one more time without the NOS. Run a 13.7 @103 mph, which is a bit slower than normal, but not a huge difference. Without NOS I usually run 13.58-13.65 @ around 104-105 mph.

I have a GenX2 wet-kit with all the safety stuff. The car seems to be running okay. I don't notice it running any different except for the check engine light.

Anyone have any experience with what this might be? I sure could use some help.

Thanks,

Kurt
(Also posted in Nitrous section)

 

any codes ?

 

I don't know how I can check for a code. I thought the dealership had to do that with a machine.

Kurt

 

No, you can check your own codes. Here is a link:
https://www.corvetteforum.com/techti...D=26&TopicID=1

 

Kurt i was at the track this weekend with a buddy that has a Gemini 2 NOS pkg and he had the same problem arise..(Check engine light )

He played with the settings for his Progressive Programmer and the warning light went turned off .

So it appears the programmer was giving some funky readings to the car's computer.

He ran a 12.10 with 100LB boost ..(A4 with headers & exhaust )


Jeff

 

Wow, that was pretty cool. Okay, so I pulled the codes. A whole boatload of them.

Here are the ones that concern me:

P0300H - Appears that this code in Engine Misfire Detected-B

P1638H - Not listed on the link

 

What spark plugs are you running??

 

The guy who installed the system installed NGK TR6 spark plugs. I think he gaped them .35 or .035 whatever it is supposed to be.

Are they the wrong plugs?

Kurt

 

THe check engine light flashing is THE code for misfires! I would NOT even open that bottle again until you figure why you are getting misfires. Get ATAP and you can check each cylinder. Check your wires. Are you running stock plugs??? :cheers:

 

OK the plugs are the ones to use and the gap is correct for the most part.
Check the wires. What gas you running ?

 

I run Amoco 92 Octane. Highest available in this area unless you buy 104 octane at the track.

If I had a loose wire, wouldn't it run crappy? It actually is running fine. No detectible miss.

Do you know what the P1638 code is?

Kurt

 

I just saw your other post. THANKS! That explains some things

Kurt

 

got 1638 in your other thread.
I would get an ATAP file going. A bad plug or wire are usually the cause for misfiring.

 

I was getting a misfire with TR55's. Put in the TR6's and running great now. I know you have TR6's but that does not mean that one of them may be fouled. I would change them anyway...

 

Okay, I know I am an idiot, but what is an ATAP file?

Kurt

 

Here is the stuff for the p0300. Usually it is a plug or wire. IF those are OK, you usually are fine, just some funkyness :D However, I would have a buddy run an ATAP and just chceck everything over just to be safe. I would also pull the plugs and check them if the light keep coming on. I believe, but not quite sure that a few f-body guys have had the 300 code set when they ran the gap at .035. But that is a reach to me. I gap 'em at .040 on a 100-150 shot.

 

haha no not at all. Gotta start somwhere. ATAP. is the AutoTap diagnostic file. Many people here use it to scan their pcm and check for "problems." It is used to check the knock retard, air/fuel ratio, misfires, etc.


oh here is that p0300 code

DTC P0300
System Description
The powertrain control module (PCM) uses information from the crankshaft position (CKP) sensors and from the camshaft position (CMP) sensor in order to determine if engine misfire is occurring. By monitoring the variations in the crankshaft rotational speed for each cylinder, the PCM is able to detect individual cylinder misfire events. A misfire rate that is high enough can cause damage to the three-way catalytic converter (TWC). The malfunction indicator lamp (MIL) will flash if converter damage conditions are present.

Conditions for Running the DTC
DTCs P0101, P0102, P0103, P0117, P0118, P0125, P0335, P0336, P0341, P0342, P0343, P0500, P0502, P0503, P1120, P1220, P1221, or P1258 are not set.
The engine speed is between 425-3000 RPM.
The ignition voltage is between 10-18 volts.
The engine coolant temperature (ECT) is between -7°C-130°C (+19°F-266°F).
The fuel level is more than 10 percent.
The throttle angle is steady within 1 percent.
The anti-lock break system (ABS) and the traction control are not active.
The transmission is not changing gears.
The secondary air injection (AIR) diagnostic test is not in progress.
The A/C clutch is in a steady state.
The engine is not in fuel shut-off or in decel fuel cut-off.
The antilock brake system (ABS) signals are not exceeding the rough road thresholds.
Conditions for Setting the DTC
The PCM determines that an emission type misfire is present.
The PCM determines that a catalyst-damaging misfire is present.
Action Taken When the DTC Sets
The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.
Conditions for Clearing the MIL/DTC
The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
Clear the MIL and the DTC with a scan tool.
Diagnostic Aids

Important
Before you service the PCM and the throttle actuator control (TAC), remove any debris from the module connector surfaces. Inspect the module connector gaskets when you diagnose or replace the modules. Ensure that the gaskets are correctly installed. The gaskets prevent contaminate intrusion into the modules.
For any test that requires probing the PCM or probing a component harness connector, use the J 35616-A connector test adapter kit . Using this kit prevents damage to the harness and component terminals. Refer to Using Connector Test Adapters in Wiring Systems.

Running the vehicle out of fuel causes sufficient misfire to set DTC P0300. A vehicle that is out of fuel may have DTC P0461 and DTC P1431 also set.
A restricted fuel filter can cause sufficient misfire to set DTC P0300. Refer to Fuel System Diagnosis .
A misfire that only occurs during certain conditions may be difficult to locate. Observe the Freeze Frame and the Failure Records in order to determine when the DTC set.
Excessive vibration from sources other than the engine could cause a misfire DTC. Possible sources of vibration are listed below:
Variable thickness in the brake rotor
An unbalanced propeller shaft
Certain rough road conditions
If more than 1 cylinder is misfiring, the scan tool may only display 1 misfiring cylinder. This condition is not apparent until the repair is completed. Also, if an ignition coil or module ground circuit is open for 1 side of the engine, the scan tool may only display 2 or 3 misfiring cylinders. Inspect the ground circuit for the ignition coil and for the modules on the cylinder bank of the engine that has more than one misfiring cylinder.
A misfire may not be apparent at idle. The misfire may only occur above idle during a load. Road-test the vehicle, and monitor the misfire current counters.
For an intermittent condition, refer to Intermittent Conditions .

 

Edit... opps Chalky sold it ....

opps here is the web page for you to look over.

I think ChalkyC5 from Wiscousin is selling his for a great price. Check it out over in the C5 parts for sale section. He is a good guy.
http://www.autotap.com/

Running nitrous is a great reason to get the software.


[Modified by intel55, 10:42 PM 4/14/2002]

 

Well, that seems to be it. My car was bogging down and would not shift into 3rd gear. And it says "The transmission is not changing gears."

Once it did shift, it took off like a rocket, and I got a 116.92 mph trap speed running a 12.701.

I lowered the window switch from 5800 rpms to 5600 rpms hoping it would shift better.

Hmmm, very interesting.

You are so very helpful. Just make sure I never get your home phone number because I would be calling you ALL the time :D

Thanks again

Kurt

 

haah glad to help. I destroyed my tranny using the gas, but it held up for quite some time so I did not complain. The 2-3 clutch packs left me. Shifting into 3rd finally left the building. Then I lost lost 2nd and finally it was in 1st and had to get it up to 4000 rpm+ just to move it get it on the flat bed :D

Losing the tranny is just a matter of time using nitrous. The more use the nos and the bigger you spray the pace quickens.

You shold be fine with a 100 shot, but you never really know. :cheers:


oh also I notice on your mph. When my tranny begun to give up the ghost my mph shot higher because it was slipping. So with that mph so high it may be a good indication of the tranny leaving this worldly existence :D :D

My mph went from 113 to 123!!! and then she went kaboom about 2-3 weeks later :(


[Modified by intel55, 10:53 PM 4/14/2002]