GTS ACR will not rev above 3500 rpm, what's could be wrong?

[HorusRa]

Hi Guys,

My '2000 GTS ACR will not rev above 3500 rpm, what's could be wrong? It's been stored for a couple years without too much running. What should I be looking for? Spark plugs, magnetic Coils, distribution wires, ??? Its got 40K miles.
Thanks

 

[Mark Crosby]

Check your spark plug wires and make sure they’re not lose, cut or broken going to any of the plugs. Check engine light? Codes? Need more info to help.

 

[HorusRa]

Hi Mark, Thanks for the quick response. My Check Engine Light is on but only for bad reading of O2 sensor of aftermarket Corsa exhaust (not an issue) but I will double check with OBDII, would that give me a code for this type of limited rev problem? I have brand new ignition coil, plugs and plug harness to install, that might only help right? Love the car anyway!

 

[redtanrt10]

You might have a plugged cat(s).

 

[Mark Crosby]

Redtanrt10 could be right to with the plugged cats. If you got codes, post emm up. I had some o2 sensor codes because of long tube headers. Had to relocate the upstreams closer to the block. They weren’t heating up fast enough and the car wouldn’t go into closed loop mode, causing my car to just stay running rich which is not good for cats. Hopefully this may help you in a right direction

 

[redtanrt10]

Mark, I don't have codes but pull the sills off and take a look. The cores can come apart. I'd reach out to Dan Cragin at SPT, not sure where in Ca you are, he's east of LA. I've heard folks say a bad cat can do what you're experiencing.

 

[Mark Crosby]

I was trying to help out HorusRa. I was sharing what I experienced in the past. I already fixed my problem a while ago lol. Just sharing what did happen to me and what could have been a problem to plug a set of cats by running to rich, but never happened to mine. Caught the problem right away

 

[Ulysses]

You should check if your battery is in good shape. A bad cell will cause low voltage and your car will not perform correctly. Batteries often go bad if the car is stored without some kind of battery tender. Vipers are very sensitive to low voltage levels.

 

[littlecaars]

I agree with the previous comments about a possible clogged cat. The first thing that came to my mind when you said the car was in storage for an extended period of time was a clog exhaust. I had a customer that had the same situation and when we took the exhaust apart it was clogged with mice for about 3 feet.

 

[kssssnake]

Typically air or fuel flow. Plugged intake or exhaust or fuel filter. Had the same thing on another vehicle. Fuel filter plugged. Would not rev. Also. had mice fill an air box on our daily driver.

 

[WHY U TRY]

If you want to get rid of the 02 CE code, I put two of these on each rear o2 sensor when I removed my cats and have never seen a code after many thousand miles. These remove it out of the way. Mine is a 2000 ACR as well.

https://www.amazon.com/gp/product/B0002JMS6I/ref=ppx_od_dt_b_asin_title_s00?ie=UTF8&psc=1

 

[Dan Cragin]

Check your fuel pressure. Drive it with a gauge attached and see if the pressure drops when it looses power. I typically just tape the gauge to the windshield.

 

[DarkSnake]

If you have substantial power below the 3500 peak rpm, I would guess that the trans sensor has failed and your ECU thinks you are in Neutral. But that could be determined at the dealer on their computer.