1990 first drive this season - ZR-1 Net Registry Forums

jrd1990zr1 · 07-06-2020

Finally was able to take my 1990 out this summer for a drive. I noticed at lower RPMs (idle-2000) when you apply the gas petal it hesitates and stumbles then catches. Replaced injectors with FICs about 3 -4 years ago. I only put about 3-4000 miles a year on the car. Does this sound like plug wires or plugs? No codes. Could the injectors go out in this short of time? Is there something I am not thinking of??

Thanks in advance for your thoughts.

-=Jeff=- · 07-07-2020

Old gas? or all fresh?

jrd1990zr1 · 07-07-2020

Quote:

Originally Posted by -=Jeff=-

Old gas? or all fresh?

I filled the tank at the end of last season with premium and added fuel stabilizer per directions. I thought I had read a post that the tank should be full for winter storage? Could this damage the injectors?

-=Jeff=- · 07-07-2020

no, I always store with full tank, just trying to get a gauge for the fuel.. I got a tank of bad gas (from BP) recently.. first time I every had an issue..

No codes.. hmmm, you have a scanner to see what the car is doing?

jrd1990zr1 · 07-07-2020

Quote:

Originally Posted by -=Jeff=-

no, I always store with full tank, just trying to get a gauge for the fuel.. I got a tank of bad gas (from BP) recently.. first time I every had an issue..

No codes.. hmmm, you have a scanner to see what the car is doing?

Thanks Jeff, unfortunately on only have a set of Gordon's plugs for the car. Could this be a spark plug wire or plug issue. I hate to pull the plenum to change out wires then find out it is not the problem.

Thanks again.

amoprx · 07-07-2020

I had the same problem with my 90' Check the throttle position sensor.

jrd1990zr1 · 07-08-2020

Quote:

Originally Posted by amoprx

I had the same problem with my 90' Check the throttle position sensor.

Guess I am going to sound stupid, but how do you check it?

Thanks

Young1 · 07-08-2020

Time for Italian Tune Up?

lfalzarano · 07-09-2020

Quote:

Originally Posted by Young1

Time for Italian Tune Up?

Agree

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jrd1990zr1 · 07-10-2020

Quote:

Originally Posted by lfalzarano

Agree

Sent from my iPhone using ZR-1 Net Registry

Funny, Mystic told me the same thing.

He is also lending me his fuel pump jumper to see if the primary pump is going. I missed out on the jumper buy.

Soon as it comes by snail mail I am going to check that and then also get a loaner pressure gauge to check that.

If fuel pump is ruled out then I might try your advice.

07-06-2020	#1
jrd1990zr1 Join Date: Dec 2005 Location: Delanson, NY Posts: 911	1990 first drive this season Finally was able to take my 1990 out this summer for a drive. I noticed at lower RPMs (idle-2000) when you apply the gas petal it hesitates and stumbles then catches. Replaced injectors with FICs about 3 -4 years ago. I only put about 3-4000 miles a year on the car. Does this sound like plug wires or plugs? No codes. Could the injectors go out in this short of time? Is there something I am not thinking of?? Thanks in advance for your thoughts. __________________ 1968 convertible Lemans Blue, 1986 coupe Medium Blue NCRS Top Flight (sold), 1990 ZR1 #2529 Red NCRS Regional and National Top Flight (sold), 1990 ZR1 #2124 Charcoal Metallic NCRS Top Flight 2010 & 2018, 2003 Anniversary Red Convertible (sold)

07-07-2020	#2
-=Jeff=- Join Date: Jul 2007 Location: Bartlett, IL Posts: 7,153	Re: 1990 first drive this season Old gas? or all fresh? __________________ 1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978

07-07-2020	#4
-=Jeff=- Join Date: Jul 2007 Location: Bartlett, IL Posts: 7,153	Re: 1990 first drive this season no, I always store with full tank, just trying to get a gauge for the fuel.. I got a tank of bad gas (from BP) recently.. first time I every had an issue.. No codes.. hmmm, you have a scanner to see what the car is doing? __________________ 1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978

07-07-2020	#6
amoprx Join Date: Jun 2020 Location: Michigan Posts: 2	Re: 1990 first drive this season I had the same problem with my 90' Check the throttle position sensor.

07-08-2020	#8
Young1 Join Date: Sep 2016 Location: Ocala, FL Posts: 889	Re: 1990 first drive this season Time for Italian Tune Up? __________________ Steve Young 1991 ZR-1 Quasar Blue Metallic/Black #729 Second Owner 1991 ZR-1 Dark Red Metallic/Black #2040 SOLD 1990 ZR-1 Dark Red Metallic/Saddle #1670 SOLD Double your happiness.....complain half as much.