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jrd1990zr1 · 12-17-2005

Hi,

Just picked up my 1990 ZR1 about a month ago, obtained it from an exotic car dealer. On the 2+ hour ride home, I noticed a stumpling (hesitation) when I put my foot into it. I have now learned the previous owner had the fuel filter replaced due to gunk in it, the injectors cleaned and put on a dyno where it was claimed to make 345 HP at the wheels. I also recently learned that the car was stored with very little fuel for about 2 years.

The dealer wants me to replace the fuel filter again and I plan to check it for gunk. I have found a place which has a chassis dyno where we plan to put the car on with a new fuel filter and a pressure guage in line to see if there is a problem with the pump pressure under a load. This time of year I can't put it on the road.

Any thoughts on what the proper pressure should be if the pump is working properly?

Any thoughts on other possible causes to the stumpling problem?

Thanks for the advice.

12-17-2005	#1
jrd1990zr1 Join Date: Dec 2005 Location: Delanson, NY Posts: 925	New ZR1 owner Hi, Just picked up my 1990 ZR1 about a month ago, obtained it from an exotic car dealer. On the 2+ hour ride home, I noticed a stumpling (hesitation) when I put my foot into it. I have now learned the previous owner had the fuel filter replaced due to gunk in it, the injectors cleaned and put on a dyno where it was claimed to make 345 HP at the wheels. I also recently learned that the car was stored with very little fuel for about 2 years. The dealer wants me to replace the fuel filter again and I plan to check it for gunk. I have found a place which has a chassis dyno where we plan to put the car on with a new fuel filter and a pressure guage in line to see if there is a problem with the pump pressure under a load. This time of year I can't put it on the road. Any thoughts on what the proper pressure should be if the pump is working properly? Any thoughts on other possible causes to the stumpling problem? Thanks for the advice.