I have a 2002 corvette with 52,000 miles. It has a BBK throtle body, Magna flw exhaust and a K&n air kit. As I am driving at any speed, the car will stumble. I don't here it but can feel it. It dose not do it all the time but maybe like every 10 miles and under 2000 RPM. Any idea what it could be?

 

Describe the "stumble" better--Does it sound like a misfire ? or more of a bog or delay?

 

It feels like the brakes are pushed very light an fast. I guess it could be descibed as a misfire. I bought the car 3 weeks ago and the guy who I bough it from said he put new plugs in it two yars ago. Some times I can here a misfire when I first start it

 

Check the MAF sensor wire for oil from the K&N. Over-oiling can cause drivability issues if some of the oil coats the MAF (heated) wire. If so, clean the wire with CFC cleaner, but be careful not to break the wire.

 

Read the diagnostic codes off your instrument cluster and post them here.

 

Is it a momentary front-rear bucking, like hitting the rev limiter but feels much harsher?

I had a similar issue last month right after my head/cam swap. It was just a loose plug wire. It never threw a code, but would sometimes "skip a beat" at 1500 rpm under load. At idle or maintaining speed it was fine. It just occured when accelerating like at 50mph in 5th or 6th gear.

If the former owner just did plugs and not wires, they often get damaged during removal. I destroyed 4 of the 8 plug wires on my 2002 during my H/C project.

Todd

 

It feels very light. Just a light bog. I will clean the MAF this weekend and order some wires. My check engine light is not on. If I get any codes I will post them. Thank you guys

 

Is it ok to use carb or brake cleaner on the MAF?

 

Use electrical component cleaner...they sell it at regular autoparts stores.

 

I have contact cleaner and it has a picture of an electrical plug of it? Is that the stuff

 

Well,,,, The VERY FIRST thing that you need to do is read the DTCs. It will give us a lot better chance to get the diagnosis correct.

Read the DTC now and write them down.. CLEAR ALL OF THEM and then take the car for a drive and when the issue happens read the DTCs without turning off the ignition.

When the event happens look at the DIC and see if it has any messages or see if the CHECK ENGINE LIGHT (CEL) is flashing!! CHECK ENGINE LIGHT (CEL) flashing is an indication of a misfire...

BILL

READING YOUR Engine Diagnostic Trouble Codes (DTC)

This procedure should be carried out any time you experience a problem with your C5. Most inexpensive store bought aftermarket code readers will ONLY read power train DTC’s. Reading the DTC’s with the C5 built in code reader will allow you to read ALL the modules in the vehicle.

The Diagnostic Display Mode is entered with the following procedure:
1) Turn on the ignition but don't start the engine.
2) Press the RESET button to turn off any warning messages. (i.e. door open, trunk open ect)
3) Press and hold the OPTIONS button
4) While holding OPTIONS, press FUEL button four times within a 10 -second period.

Initially, the on-board diagnostics go into an Automatic Mode which will cycle through each module and shows diagnostic codes in a pre-set sequence: PCM - TCS - RTD - BCM - IPC - RADIO - HVAC - LDCM - RDCM - SCM - RFA. All codes will be displayed for each module. ( i.e. PCM = 4 codes) If none are present in a given module, you will see No More Codes on the display.

There are two types of diagnostic codes, Current and History designated with a letter suffix, “C” or “H”. A current code indicates a malfunction is present in the module displaying data. A history code indicates a problem existed sometime in the last 40 or 50 ignition cycles. When not accompanied by a current code of the same number, it's potential evidence of a previous problem, now resolved, that was not removed by clearing the codes. More likely it's an indication of an intermittent malfunction.

Intermittent codes are the most challenging of the diagnostics. An intermittent code may have happened once, may have happened more than once but is inconsistent or may be happening on a regular basis but not at the time the codes are displayed. History codes can also be caused by a current malfunction in a system that is not operating at the time codes are displayed. An example is the rear window defogger which doesn't operate until the Body Control Module detects engine rpm. For history codes set by a module that does not operate with the key on and engine off, a special diagnostic tool called a Scan Tester is necessary to properly diagnose the malfunction.

Once the system has displayed all modules, it goes into the manual mode which allows selection of each module using combinations of Driver Information Center buttons. Manual mode can also be entered during the automatic sequence by pressing any button except E/M. Once the display shows Manual Diagnostics, select a module by pressing the OPTIONS button to go forward or the TRIP button to go back. Once a module is selected, a code is displayed, and if more than one are present; press GAGES to go forward or FUEL to go back.
To exit the diagnostic mode at any time, press E/M. If you want to erase codes in a given module, press RESET To reset the codes once in manual mode, press and hold RESET until it displays NO CODES Press OPTIONS to go to the next module. Repeat the steps until you have reset the codes in all the computer modules.
NOTE!! Only reset the codes IF you want to - it is NOT necessary to do this. Clearing a code does not repair a problem. You are simply erasing the evidence of it in the module's memory. If you clear the code/s, and extinguish the Check Engine Light, your emissions status ready will NOT allow you to pass an emissions test until you have completed the required driving cycles. There are a few body module DTC’s that if set will prevent the module from operating properly. Once the DTC is cleared, the module will return to full function. This is not true for power train DTCs.

If you have never read and cleared your codes, there will probably be a lot of old history DTCs. It is recommended that you clear your codes and see if any come back during a driving cycle. Those are the ones that you need to concentrate on diagnosing.

Once you have the codes, the next question is: What to do with the information?
First, consult the factory service manual. Any serious C5 Do-It-Yourself owner should invest in the Corvette Service Manual of the appropriate model year. The Service Manual is really a requirement if you want to understand and work on your C5.

NOTE and a WARNING. You can read the DTCs while the engine is running. I pull mine up all the time while driving.
WARNING. Don’t become distracted while reading DTCs while your driving and cause an accident!!!!! Use common sense and drive safe.

These are some very good C5 Diagnostic Trouble Code (DTC) explanation web sites!!! They also explain how to read the DTCs

Here are some very good sites that explain what DTC mean:

http://www.gearchatter.com/viewtopic11755.php

http://www.obd-codes.com/trouble_cod...d-ii-codes.php

Make sure to include the H or C suffix when you post your DTCs!!

 

Holy crap. I have tons of codes, B2252H, B2282H, B2284H, U1064H, B2283H, B2285H,U1064H, C2100HC, C2105HC, C2110HC, C2115HC, U1255H, Wht the heck. The car seem to be running fine

 

"H" means History..."C" means current (the "C" at the END of the number...not the first one!). Once you get into the diags, hold down the reset button for a few seconds and it'll clear them all out. Then go for a decent ride and check for codes before shutting off the engine.

 

all of your "current" faults marked with the "C"at the end, are coming from your tire pressure monitoring sensors. So that isn't telling us much...like JM20 said...clear all the codes and see what comes back.

C2100 Left Front TPM Sensor Malfunction -TPM
C2105 Right Front TPM Sensor Malfunction -TPM
C2110 Right Rear TPM Sensor Malfunction -TPM
C2115 Left Rear TPM Sensor Malfunction -TPM

 

you can also look at your DIC codes while driving to try and catch it acting up...i look for codes all the time while sitting at a stop light etc.

 

I will clear them tomorrow. I just got home from a 200 mile ride. Thank you