Weird Popping
Thread Starter
Instructor
Joined: Sep 2003
Posts: 182
Likes: 0
From: SAN DIEGO CA
Weird Popping
My car has been sitting for about a year and finally after doing a major tune up and replacing my ecm i finally got it up and running. The issue i'm having is after putting new gas in and adding a fuel system cleaner when i drive and give it gas the car vibrates alot and i get alot of popping from the exhaust. Last night after taking it out again for a little drive and parking it i left the engine runing and checked under the car to notice the back portion of the cats and exhaust were red hot. I was only driving for about ten minutes. Need help with this.
92 Blk 6 Spd
113,000 miles
92 Blk 6 Spd
113,000 miles
Pro
Joined: Nov 2006
Posts: 729
Likes: 0
From: Concord North Carolina
My car has been sitting for about a year and finally after doing a major tune up and replacing my ecm i finally got it up and running. The issue i'm having is after putting new gas in and adding a fuel system cleaner when i drive and give it gas the car vibrates alot and i get alot of popping from the exhaust. Last night after taking it out again for a little drive and parking it i left the engine runing and checked under the car to notice the back portion of the cats and exhaust were red hot. I was only driving for about ten minutes. Need help with this.
92 Blk 6 Spd
113,000 miles
92 Blk 6 Spd
113,000 miles
Loud and horsepower. If you have emissions, get a high flow cat...Also dont park it in the garage or in grass area if they are glowing. Could cause a fire.
Pro
Joined: Nov 2006
Posts: 729
Likes: 0
From: Concord North Carolina
One thing I would like to add is, my car backfired and it sounded like a shotgun going off when I hit the gas it went pow and went i let off the gas it went pow pow pow....getting softer. It was the EGR. Is yours working? Been replaced? Could be that but I am just throwing out a suggestion.
Race Director
Joined: Feb 2004
Posts: 12,517
Likes: 19
Popping in the exaust is typically a rich condition. I would check to see if you have a cts or fuel problem(leaky injector bad regulator etc) before swapping out the converters. If the problem is in front of the converters, you will ruin the new converters quickly.
Drifting
Joined: Oct 2006
Posts: 1,554
Likes: 13
From: Romeoville IL
Magnaflow bought out Carsound, and is using their designs and selling for a cheaper price than they were being sold as Carsound cats.
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Thread Starter
Instructor
Joined: Sep 2003
Posts: 182
Likes: 0
From: SAN DIEGO CA
I already replaced the EGR. When i had to replace it the computer through a code for it. I have no "check engine" light but i could have the injectors checked out. I just don't see how bad injectors could cause my exhaust pipes to glow, but thats why i'm glad you guys are here for assistance. Thanks.
92 Blk 6 Spd
92 Blk 6 Spd
Racer
Joined: Dec 2006
Posts: 369
Likes: 0
From: Indiana
yeah your car is running rich, the excess unburned fuel in the catalytic converter causes it to glow. the popping sound is the engine backfiring. are you SURE theres no DTC's?
why did you replace the ECM? what did you do in your "tune up"? more detail
why did you replace the ECM? what did you do in your "tune up"? more detail
Thread Starter
Instructor
Joined: Sep 2003
Posts: 182
Likes: 0
From: SAN DIEGO CA
Tune up- replaced opti, wires, plugs, filters, changed all fluids to include manual tranny fluid. I changed the ECM because it was acting up, my speedo would go blank while i was driving the car, the revs kept bouncing around (even though i changed the tps, iac and electronic control module). On the advice of a mechanic friend of mine i replaced the ECM and the car started right up. He suspected the original ecm was damaged over time from heat soak. I'll check on the fuel system.
92 Blk 6 Spd
92 Blk 6 Spd
Pro
Joined: Nov 2006
Posts: 729
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From: Concord North Carolina
Tune up- replaced opti, wires, plugs, filters, changed all fluids to include manual tranny fluid. I changed the ECM because it was acting up, my speedo would go blank while i was driving the car, the revs kept bouncing around (even though i changed the tps, iac and electronic control module). On the advice of a mechanic friend of mine i replaced the ECM and the car started right up. He suspected the original ecm was damaged over time from heat soak. I'll check on the fuel system.
92 Blk 6 Spd
92 Blk 6 Spd
Le Mans Master
Joined: Feb 2006
Posts: 8,753
Likes: 9
From: Louisiana
CRVETTE92, I would be hesitant to say your engine is running rich without proof. You can check for fuel pressure leak down and run a ECM scan to be sure, plus other things. If the cats are glowing....more than likely they are bad/clogged. If the engine is running rich, replacing the cats will not do much good, because the first 100 miles or so the new cats will be bad too. Why did the cats go bad? Could be from age and/or a rich condition.
B!@cK 86 V3tt3, I would not say your ECM is bad just from what you have stated.
B!@cK 86 V3tt3, I would not say your ECM is bad just from what you have stated.
Last edited by RRT vette; Dec 24, 2006 at 07:12 PM.
Thread Starter
Instructor
Joined: Sep 2003
Posts: 182
Likes: 0
From: SAN DIEGO CA
I would strongly get it checked before i start throwing parts at your problems. I had alot of your same issues. When i replaced the ecm the car started right up. They are a few threads on this topic you can do a search on for more input.
92 Blk 6 Spd
92 Blk 6 Spd
Drifting
Joined: Sep 2003
Posts: 1,325
Likes: 0
From: Winter Haven Fl
My car has been sitting for about a year and finally after doing a major tune up and replacing my ecm i finally got it up and running. The issue i'm having is after putting new gas in and adding a fuel system cleaner when i drive and give it gas the car vibrates alot and i get alot of popping from the exhaust. Last night after taking it out again for a little drive and parking it i left the engine runing and checked under the car to notice the back portion of the cats and exhaust were red hot. I was only driving for about ten minutes. Need help with this.
92 Blk 6 Spd
113,000 miles
92 Blk 6 Spd
113,000 miles
I also had popping and sputtering from my car last week, got a load of fuel with water in it. 2 bottles of dry gas took care of it. You might want to try that also.
Instructor
Joined: Apr 2006
Posts: 194
Likes: 0
From: edmonton alberta
,i don't think its running rich ,maybe a few rodents made a nests in the converter and you would be surprised what they drag in their. i seen that before on a blazer my buddy got off a farm it sat for about a year and on the way home it started to lose power then finally it stopped we looked under it and the converter was red hot so we towed it home and cut the converter out and found a huge rodent nest. their was hay,wood,foil,and wat ever else they can get in their.check it out
Pro
Joined: Nov 2006
Posts: 729
Likes: 0
From: Concord North Carolina
,i don't think its running rich ,maybe a few rodents made a nests in the converter and you would be surprised what they drag in their. i seen that before on a blazer my buddy got off a farm it sat for about a year and on the way home it started to lose power then finally it stopped we looked under it and the converter was red hot so we towed it home and cut the converter out and found a huge rodent nest. their was hay,wood,foil,and wat ever else they can get in their.check it out
Any actual rats in there when ya took it off?
Pro
Joined: Nov 2006
Posts: 638
Likes: 0
From: Plano TX
Wow, I know a thing or two about rats... check out my post to see:
http://forums.corvetteforum.com/show....php?t=1581408
As far as the red hot exhaust, I noticed on my 85 that the exhaust was glowing bright red after 3 minutes of running shortly after getting mine back up after 5 years of sitting. I too thought the cat was bad because of rodent issues... come to find out he cat was perfectly fine and the engine was actually just running rich. After some fuel system work everything was back up and running perfect.
http://forums.corvetteforum.com/show....php?t=1581408
As far as the red hot exhaust, I noticed on my 85 that the exhaust was glowing bright red after 3 minutes of running shortly after getting mine back up after 5 years of sitting. I too thought the cat was bad because of rodent issues... come to find out he cat was perfectly fine and the engine was actually just running rich. After some fuel system work everything was back up and running perfect.
Pro
Joined: Nov 2006
Posts: 729
Likes: 0
From: Concord North Carolina
Wow, I know a thing or two about rats... check out my post to see:
http://forums.corvetteforum.com/show....php?t=1581408
As far as the red hot exhaust, I noticed on my 85 that the exhaust was glowing bright red after 3 minutes of running shortly after getting mine back up after 5 years of sitting. I too thought the cat was bad because of rodent issues... come to find out he cat was perfectly fine and the engine was actually just running rich. After some fuel system work everything was back up and running perfect.
http://forums.corvetteforum.com/show....php?t=1581408
As far as the red hot exhaust, I noticed on my 85 that the exhaust was glowing bright red after 3 minutes of running shortly after getting mine back up after 5 years of sitting. I too thought the cat was bad because of rodent issues... come to find out he cat was perfectly fine and the engine was actually just running rich. After some fuel system work everything was back up and running perfect.
Thre was a dead rat on your block...... That is hilarious........ That just made my day...