Hey guys, I recently bought a 1995 Chevy 2500 with 6.5 and so far I really like it. This is my first diesel ever by the way. A problem I have noticed though is most of the time when accelerating hard especially when going uphill, my ses light flashes and there is a noticeable loss of power, no miss or anything else, just loss of power. I can stop, shut the engine off and restart and it runs fine until i accelerate hard again. I tried to check codes but when i do, the service engine soon light doesn't flash to indicate what is wrong. Any ideas Please? Thanks
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Service engine soon light flashes when accelerating
- Thread starter billky
- Start date
ak diesel driver
6.5 driver
sounds like an overboost code or a high IAT code or even an egr code. Have you checked codes?
Flashing SES light is a misfire at least for gas engines. It means stop NOW!!! Quit trying to push your engine - stop running it till it is fixed. Misfire will make your block look like the one in my pic to the left... (I don't know that this mode exists for diesels, but it is a very bad sign even if it doesn't.)
It is possible you have a bad bulb or connection causing the steady light to flash. Does the SES light light up when you turn the key on but not running the engine? Aka "Bulb check"? Verify a working SES light before anything else.
My 1993 would flicker the SES light and the problem wasn't the ECM, transmission etc. it had to be wiring.
In your case make sure you have the A&B terminals for the paperclip. Next you need to troubleshoot grounds. The computer needs a specific voltage to enter the diagnostic mode. Start with checking the paperclip for voltage when shorting the A and B. The connector ground may be open. Next check the two grounds by the transmission dipstick. One of them is for the computer. Next check battery voltage. 12.6 to 12.8 volts or more.
Check fuses for corrosion.
It is possible you have a bad bulb or connection causing the steady light to flash. Does the SES light light up when you turn the key on but not running the engine? Aka "Bulb check"? Verify a working SES light before anything else.
My 1993 would flicker the SES light and the problem wasn't the ECM, transmission etc. it had to be wiring.
In your case make sure you have the A&B terminals for the paperclip. Next you need to troubleshoot grounds. The computer needs a specific voltage to enter the diagnostic mode. Start with checking the paperclip for voltage when shorting the A and B. The connector ground may be open. Next check the two grounds by the transmission dipstick. One of them is for the computer. Next check battery voltage. 12.6 to 12.8 volts or more.
Check fuses for corrosion.