ZR-1 Net Registry Forums - View Single Post - 1990 ZR-1 Hesitation when full Power

tnova · 01-14-2019

As others with more experience have guided, check all they have listed. I had stumbling secondaries on my '91. Did all the that has been listed and while it improved, didn't totally go away. Even sometimes felt weak on primaries, but mostly under hard acceleration. Was hell getting it through CA smog. Skip two years forward and I found the problem, car had 160,000 miles on it and the catalyst in the converters had collapsed. They sounded like gravel in a tin can. So, hopefully your problem resolved before you get to this possibility. My fix - moved to WA with no smog for '91 and headers with C-6 cats.

01-14-2019	#9
tnova Join Date: Oct 2013 Location: Spokane Valley, WA Posts: 115	Re: 1990 ZR-1 Hesitation when full Power As others with more experience have guided, check all they have listed. I had stumbling secondaries on my '91. Did all the that has been listed and while it improved, didn't totally go away. Even sometimes felt weak on primaries, but mostly under hard acceleration. Was hell getting it through CA smog. Skip two years forward and I found the problem, car had 160,000 miles on it and the catalyst in the converters had collapsed. They sounded like gravel in a tin can. So, hopefully your problem resolved before you get to this possibility. My fix - moved to WA with no smog for '91 and headers with C-6 cats.