89 Vette slow, backfires WOT
Thread Starter
Heel & Toe
Joined: Nov 2011
Posts: 24
Likes: 0
89 Vette slow, backfires WOT
Well it was all good, but not anymore, my car is now slow at WOT and now it is backfiring at WOT as well. It feels like my pistons don't want to move. I thought it was push rods, but I was wrong.
The car has 60K miles replaced cap/rotor/wires and got a new exhaust y-pipe and catyltic converter. Other than that it's all stock.
The car has 60K miles replaced cap/rotor/wires and got a new exhaust y-pipe and catyltic converter. Other than that it's all stock.
Burning Brakes
Joined: Aug 2010
Posts: 833
Likes: 1
You need to check your fuel pressure, ignition timing, adjust TPS sensor, check for diagnostic codes and test your injectors. If you are still using your stock 23 year old injectors you'd be surprised how different the car would feel with new ones.
Race Director
Joined: Nov 2003
Posts: 12,221
Likes: 446
From: Overland Park Kansas
2020 Corvette of the Year Finalist (appearance mods)
C4 of Year Winner (appearance mods) 2019
Yeah...like double-check your plug wire routing. Switching two adjacent cylinders will let it run, but backfire under load.
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Brett Foote
Le Mans Master
Joined: Jul 2007
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From: Tampa Florida
Well it was all good, but not anymore, my car is now slow at WOT and now it is backfiring at WOT as well. It feels like my pistons don't want to move. I thought it was push rods, but I was wrong.
The car has 60K miles replaced cap/rotor/wires and got a new exhaust y-pipe and catyltic converter. Other than that it's all stock.
The car has 60K miles replaced cap/rotor/wires and got a new exhaust y-pipe and catyltic converter. Other than that it's all stock.
there are many things to check before throwing parts at it.To me, from your description, it sounds like a MAF/fueling related issue.
Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
Thread Starter
Heel & Toe
Joined: Nov 2011
Posts: 24
Likes: 0
Greggpenn was right I had a spark plug wire on the wrong plug.. Feel stupid for not seeing it. Now for the adjustment process on the push rods I did 1/4turn, how many turns are you suppose to do?
Appreciate everyone elses advice. Thank you.
Appreciate everyone elses advice. Thank you.
Safety Car
Joined: Apr 2011
Posts: 3,660
Likes: 22
NONE.
its a roller/hydraulic cam/lifter. Unless the heads have been off or rockers removed there is more harm than good if you start messing with rocker adjustment. You are no where near the miles to consider that. The tick that you hear is injectors, not valves.
its a roller/hydraulic cam/lifter. Unless the heads have been off or rockers removed there is more harm than good if you start messing with rocker adjustment. You are no where near the miles to consider that. The tick that you hear is injectors, not valves.
