New Owner with Q's - ZR-1 Net Registry Forums

emmvette · 07-26-2013

Hi, As mentioned in my other thread, I finally brought a 90 ZR-1 home.
Now its time to dig into a few issues and get her ready for some action.

It has 22k on the clock. Has not be run too much the last few years, but has been driven a few times a year to keep it up.

I have only driven it a little and I'm getting a few questions already.

The first is, I was told the car has the standard rear end gearing (3.45). In first gear at 7,000 rpm I'm hitting about 55 mph, second gear at 7,000 rpm is about 82 mph. Does this sound correct? Tires are OEM size. I think this is about correct, but not sure.

Second question is I'm getting some hesitation in a couple areas; the car will occasionally act like its really kicking in and surge. It is not doing this consistently, but occasionally. Its almost like a hard downshift or a very slight pause then it kicks in when the pedal is mashed. I noticed this about 3,000 rpm a few times - it doesn't consistently do that.
Car just had new plug and wires installed prior to my purchasing it.

Last question for today is the car seems to stumble a little around 6500-6,800 rpm. Almost like its missing or trying a little to backfire.

Any suggestions on where to start trouble shooting would be great. Hopefully basic stuff. I'm not afraid to turn a wrench, but will be learning as I go.

Oil is draining from the first oil change as I write.... drip, drip, drip.

07-26-2013	#1
emmvette Join Date: Jul 2013 Location: Central Iowa Posts: 187	New Owner with Q's Hi, As mentioned in my other thread, I finally brought a 90 ZR-1 home. Now its time to dig into a few issues and get her ready for some action. It has 22k on the clock. Has not be run too much the last few years, but has been driven a few times a year to keep it up. I have only driven it a little and I'm getting a few questions already. The first is, I was told the car has the standard rear end gearing (3.45). In first gear at 7,000 rpm I'm hitting about 55 mph, second gear at 7,000 rpm is about 82 mph. Does this sound correct? Tires are OEM size. I think this is about correct, but not sure. Second question is I'm getting some hesitation in a couple areas; the car will occasionally act like its really kicking in and surge. It is not doing this consistently, but occasionally. Its almost like a hard downshift or a very slight pause then it kicks in when the pedal is mashed. I noticed this about 3,000 rpm a few times - it doesn't consistently do that. Car just had new plug and wires installed prior to my purchasing it. Last question for today is the car seems to stumble a little around 6500-6,800 rpm. Almost like its missing or trying a little to backfire. Any suggestions on where to start trouble shooting would be great. Hopefully basic stuff. I'm not afraid to turn a wrench, but will be learning as I go. Oil is draining from the first oil change as I write.... drip, drip, drip.