2010 Base - Issues
Thread Starter
Intermediate
Joined: Aug 2019
Posts: 27
Likes: 9
From: TX
2010 Base - Issues
Hey all!
Newer to the forums. Bought the car back in June, with 62k miles on it.
Replaced spark plugs (AC Delco), and wires (Taylor)
Mods:
-Vette-Air scoop
-CAI - which I removed, and put stock back on due to surging
-Catch Can
-Magnaflow Axle back mufflers
Issues that have developed over the past month:
-Rough Idle at 500rpm, with rare shudder, like it's about to die, but doesn't.
-low popping sound in exhaust
-Fuel consumption is up
-Some hesitation when hitting it hard, with rare stalling.
-Exhaust had the sulfur smell for it brief time
I checked all the basic stuff for peace of mind. No smoke from exhaust. No milk in the coolant. No milk in the oil, totally clean. No huffing from the oil fill (very slight suction actually).
I have taken it to a shop that specializes in Vettes. Had random misfire codes. They did a resistance check on the injectors...all good. They had a set of coil packs, and swapped them out to test. No change. They ran some scope, and said all the cylinders were firing. Replaced the upstream o2 sensors for grins, no change.
Frustrated as hell. Never get a CEL, except for the occasional tire pressure monitor, which needs to be replaced.
Throttle body issue?
ECM?
Newer to the forums. Bought the car back in June, with 62k miles on it.
Replaced spark plugs (AC Delco), and wires (Taylor)
Mods:
-Vette-Air scoop
-CAI - which I removed, and put stock back on due to surging
-Catch Can
-Magnaflow Axle back mufflers
Issues that have developed over the past month:
-Rough Idle at 500rpm, with rare shudder, like it's about to die, but doesn't.
-low popping sound in exhaust
-Fuel consumption is up
-Some hesitation when hitting it hard, with rare stalling.
-Exhaust had the sulfur smell for it brief time
I checked all the basic stuff for peace of mind. No smoke from exhaust. No milk in the coolant. No milk in the oil, totally clean. No huffing from the oil fill (very slight suction actually).
I have taken it to a shop that specializes in Vettes. Had random misfire codes. They did a resistance check on the injectors...all good. They had a set of coil packs, and swapped them out to test. No change. They ran some scope, and said all the cylinders were firing. Replaced the upstream o2 sensors for grins, no change.
Frustrated as hell. Never get a CEL, except for the occasional tire pressure monitor, which needs to be replaced.
Throttle body issue?
ECM?
Last edited by slam69; Dec 3, 2019 at 09:06 AM.
Race Director
Joined: Sep 2009
Posts: 11,338
Likes: 2,437
From: Eastern
Hey all!
Newer to the forums. Bought the car back in June, with 62k miles on it.
Replaced spark plugs (AC Delco), and wires (Taylor)
Mods:
-Vette-Air scoop
-CAI - which I removed, and put stock back on due to surging
-Catch Can
-Magnaflow Axle back mufflers
Issues that have developed over the past month:
-Rough Idle at 500rpm, with rare shudder, like it's about to die, but doesn't.
-low popping sound in exhaust
-Fuel consumption is up
-Some hesitation when hitting it hard, with rare stalling.
-Exhaust had the sulfur smell for it brief time
I checked all the basic stuff for peace of mind. No smoke from exhaust. No milk in the coolant. No milk in the oil, totally clean. No huffing from the oil fill (very slight suction actually).
I have taken it to a shop that specializes in Vettes. Had random misfire codes. They did a resistance check on the injectors...all good. They had a set of coil packs, and swapped them out to test. No change. They ran some scope, and said all the cylinders were firing. Replaced the upstream o2 sensors for grins, no change.
Frustrated as hell. Never get a CEL, except for the occasional tire pressure monitor, which needs to be replaced.
Throttle body issue?
ECM?
Newer to the forums. Bought the car back in June, with 62k miles on it.
Replaced spark plugs (AC Delco), and wires (Taylor)
Mods:
-Vette-Air scoop
-CAI - which I removed, and put stock back on due to surging
-Catch Can
-Magnaflow Axle back mufflers
Issues that have developed over the past month:
-Rough Idle at 500rpm, with rare shudder, like it's about to die, but doesn't.
-low popping sound in exhaust
-Fuel consumption is up
-Some hesitation when hitting it hard, with rare stalling.
-Exhaust had the sulfur smell for it brief time
I checked all the basic stuff for peace of mind. No smoke from exhaust. No milk in the coolant. No milk in the oil, totally clean. No huffing from the oil fill (very slight suction actually).
I have taken it to a shop that specializes in Vettes. Had random misfire codes. They did a resistance check on the injectors...all good. They had a set of coil packs, and swapped them out to test. No change. They ran some scope, and said all the cylinders were firing. Replaced the upstream o2 sensors for grins, no change.
Frustrated as hell. Never get a CEL, except for the occasional tire pressure monitor, which needs to be replaced.
Throttle body issue?
ECM?
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,435
Likes: 3,982
From: Cape Coral, Florida
Sounds like maybe the car may be running a little rich...you really need a scan tool to look at some data PIDS...I diagnosed a Forum members Z06 last spring and I found a few injectors were actually flowing too much fuel...I had checked every possible cause for a rich condition (WITHOUT SWAPPING PARTS OR FOR GRINS)and the injector balance test nailed the diag !!...for a Corvette “ speciality shop” not to diagnose this concern is pretty troubling !!...if you said they “ran some scope” meaning they had used an oscilloscope they should not have had any problems fixing the car...feel bad for you and they should never had swapped out coil packs...they should know if they are good or bad by testing !’
Last edited by C5 Diag; Dec 3, 2019 at 10:23 PM.
Retired & lovin' it!
Joined: Mar 2005
Posts: 4,472
Likes: 546
From: Jackson NJ
As bigron1212 wrote, I would first suspect something in the ignition. Double check the ignition wires for a loose connection or a bad wire. You don't say which AC Delco plugs you used. As long as Iridium, you should be OK, but if you used non-iridium, that could be cause of problem.
Last edited by Dave S; Dec 5, 2019 at 11:14 PM. Reason: sp.
Race Director
Joined: Mar 2011
Posts: 13,262
Likes: 3,150
From: SW Florida
2021 C6 of the Year Finalist - Modified
It can get expensive throwing parts at the engine until you finally fix the problem .... But, if I was just replacing parts, I would replace is the MAF sensor in the air filter housing.
If you knew someone that had a similar Corvette, you could borrow his just to see if fixed the problem .... easy to swap out
ACDelco P/N: 2134222
$38.42 with free shipping
If you knew someone that had a similar Corvette, you could borrow his just to see if fixed the problem .... easy to swap out
ACDelco P/N: 2134222
$38.42 with free shipping
