acelleration problem?

[Harold Broerman]

HI all,got a low miles 90 zr-1 that i thought i had a fuel problem with,but after checking or replacing both pumps pulling and cleaning tank,new o2 sensors and checking everything else other owners have suggested. in nuetral the engine wont run over 3000 rpm .im told this is normal,because of the rev limiter, but this car wont accelerate past 3000rpm in gear, making it near impossible to drive!i would sure appreaciate any input from anyone.thanks, Harold

Does your SES light up when you cycle the key to run?

[tccrab]

Harold:

Sounds like secondary fuel injectors aren't firing. Could be a bad relay or bad injectors. Are the injectors the originals?

Just wanted to make sure that the SES light did function. Would not be the first time the bulb had been removed.

Code 61 is a secondary vacuum fault. You more than likely have a bad check valve or your storage canister could be faulty. Need to run through the diagnostic checks in the service manual.

[tomtom72]

Some of the other culprits in a DTC 61 are bad actuators, 2* solenoid, leak anywhere in the vacuum hose spyder for the 2* system, and a bad ECM.

If the code 61 sets the motor will be limited to 3k rpm. It's like driving a toyota!

I had this on my 90 about a month ago....turned out I pulled the plenum for nothing as it was the ECM. If you have a spare swap it out & see what happens. It might save you a plenum pull.


Tom

[kenthompson]

Really? Mine sets a 61 all the time, but I have no problem hitting redline.

My secondaries are tied open until I figure out how to put rotary actuators on it.

[cuisinartvette]

Rotary actuators?? Im not following you..

[tomtom72]

Originally Posted by kenthompson

Really? Mine sets a 61 all the time, but I have no problem hitting redline.

My secondaries are tied open until I figure out how to put rotary actuators on it.

According to my 90 FSM's diagnostic write up for DTC 61 the rpms are limited to 3k and the secondaries are cancelled.... it's what my car was doing...maybe because it was my ECM and not anything in the 2* system that was the cause of DTC 61 that my rpm's were limited to 3K????

I often thought that little servo motors in place of all the vacuum stuff would work but I'm not that talented....too bad we don't have fly by wire throttle controls because I would think it would be an easy adaptation from there.

[Harold Broerman]

jueffvette, this car is spooky!ses lite comes on with key, but most times it goes outwhen engine starts right now i got in the car and engine zinged right past 3000rpm in neutral. but ill bet if i take it out to drive, it wont go past 3000rpm. code scanner shows code 61, but i think we have covered most everything such as both fuel pumps both o2sensors, checker vaacum pump,pulled and cleaned gas tank. this is a 10k mile car,that has been in storage.any help will be appreaciated! if you have the time,call me at 800-475-5431 days 6am-2pm thanks a bunch!Harold

[jonszr1]

did you do a vaccume ck on the line that goes under the plenumfrom the vaccume pump? you proably have Vaccume issue under the plenum. usaual culprits accuators vaccume canister or the port throttle selinoid has died.