I have a 1998 accord turbo’d f series. I’ve noticed this issue when I got the car. It won’t rev past 5k rpm. I got it tuned and also replaced ecu and it’s still doing it. Any ideas what it could be?

 

VSS most likely. My question is how you got it tuned with it not revving past 5k..

 

they tuned it to 5k rpm lmao. Was hoping it was in the tune. But next tune they gave me half off because of it. But I replaced the vss it didn’t make a difference, I tried replacing ecu and it didn’t help either. I’m thinking maybe a faulty speedo? Would that have a affect on it ? And I say it’s the speedo maybe because my speedo mph doesn’t work and sometimes the temp just drops after it heats up.

 

VSS = vehicle speed sensor. It's what makes the speedometer work and the ECU uses the signal for various things. If you have 2 step enabled in the tune the car will cut at the 2 step RPM if the VSS is not working correctly because the ECU thinks the car isn't moving. Sounds like you need to replace it.

 

2 step isn’t on atm, I replaced the vss a couple weeks ago and it’s still going it. I know a faulty speedometer is known for vtec not working maybe it’s the reason I can’t rev past 5k. I bought a ecu the other day and I saw it being tested before I got it and it works fine. Just this issue makes no sense.

 

What engine management system do you have ?

Understanding the VSS system may light the path to repair more clearly. Replacing the VSS sensor alone does NOT guarantee a cure for the system... you can have an ECU issue, the VSS shaft key could be missing, the speedo ring could be missing from the differential body inside of the transmission case, or you could have a break/short on one or more of the three wires that plug into the VSS sensor itself. The ECU gets the VSS signal directly from the transmission first... and then it splits off and the signal is sent over to the instrument cluster to drive the speedometer. Don't make the mistake of thinking that just because the speedometer doesn't work, the ECU isn't getting the signal either.

Quality engine management systems can operate VTEC without a proper VSS signal, but you would lose the ability to set your launch control/2-step rev limit.

 

Could also be distributor related, I've had it happen before, runs fine up to some higher rpm level then cuts out. I think mine was a bad igniter.

 

Im sorry if i moved pasted it. But how did we get hung up on the vss. Last time i had a vss issue, from what i remember. Vtec wouldnt kick in, when i had an issue. Turned out to be moisture on the plug male pins. No other issue from the vss. Although, it could be different with hondatas programming.

this sounds more like a tps or dizzy issuse. More so, a dizzy issue.

 

[QUOTE=JRCivic1;52060732]What engine management system do you have ?

Understanding the VSS system may light the path to repair more clearly. Replacing the VSS sensor alone does NOT guarantee a cure for the system... you can have an ECU issue, the VSS shaft key could be missing, the speedo ring could be missing from the differential body inside of the transmission case, or you could have a break/short on one or more of the three wires that plug into the VSS sensor itself. The ECU gets the VSS signal directly from the transmission first... and then it splits off and the signal is sent over to the instrument cluster to drive the speedometer. Don't make the mistake of thinking that just because the speedometer doesn't work, the ECU isn't getting the signal either.

Quality engine management systems can operate VTEC without a proper VSS signal, but you would lose the ability to set your launch control/2-step.

well I have s300 but I just went to a junk yard pulled a cluster from a accord and took my old one out and swapped it. My lights now work and I can see if I have a check engine light on. Went to auto zone to get it checked out and they couldn’t scan it because I’m on obd2 to 1. So I’m soon today gonna open it up in hondata and see what issue I get.