Engine went NUTS
Thread Starter
Instructor
Joined: Oct 2004
Posts: 134
Likes: 0
From: Arlington Texas
Engine went NUTS
I have a question for all you vette master mechanics. All I do is put gas in the car and have fun!!
Last week, while getting on the highway in a very reasonable half throttle manner, the engine just went crazy. It flashed the "reduced power" message. When I checked the DIC, it had tripped codes 108, 1120, 1220, 1514, 1515 and 1516. If I reset the codes, they immediately reset. Also, everytime I hit reset, the engine rpms increase about 400. It still runs horrible. It just runs horrible a little faster. Also, (and this is really strange), the brakes are hard as a rock.
I'm thinking since everything just dumped at once, that something must have gotten disconnected, or a single critical sensor failed. Any ideas?? The car is a 98 A4 with a supercharged engine and a level 5 racing tranny.
TIA
Dave
Last week, while getting on the highway in a very reasonable half throttle manner, the engine just went crazy. It flashed the "reduced power" message. When I checked the DIC, it had tripped codes 108, 1120, 1220, 1514, 1515 and 1516. If I reset the codes, they immediately reset. Also, everytime I hit reset, the engine rpms increase about 400. It still runs horrible. It just runs horrible a little faster. Also, (and this is really strange), the brakes are hard as a rock.
I'm thinking since everything just dumped at once, that something must have gotten disconnected, or a single critical sensor failed. Any ideas?? The car is a 98 A4 with a supercharged engine and a level 5 racing tranny.
TIA
Dave
Tech Contributor
Joined: Apr 2007
Posts: 10,924
Likes: 78
From: Forney Texas
I have a question for all you vette master mechanics. All I do is put gas in the car and have fun!!
Last week, while getting on the highway in a very reasonable half throttle manner, the engine just went crazy. It flashed the "reduced power" message. When I checked the DIC, it had tripped codes 108, 1120, 1220, 1514, 1515 and 1516. If I reset the codes, they immediately reset. Also, everytime I hit reset, the engine rpms increase about 400. It still runs horrible. It just runs horrible a little faster. Also, (and this is really strange), the brakes are hard as a rock.
I'm thinking since everything just dumped at once, that something must have gotten disconnected, or a single critical sensor failed. Any ideas?? The car is a 98 A4 with a supercharged engine and a level 5 racing tranny.
TIA
Dave
Last week, while getting on the highway in a very reasonable half throttle manner, the engine just went crazy. It flashed the "reduced power" message. When I checked the DIC, it had tripped codes 108, 1120, 1220, 1514, 1515 and 1516. If I reset the codes, they immediately reset. Also, everytime I hit reset, the engine rpms increase about 400. It still runs horrible. It just runs horrible a little faster. Also, (and this is really strange), the brakes are hard as a rock.
I'm thinking since everything just dumped at once, that something must have gotten disconnected, or a single critical sensor failed. Any ideas?? The car is a 98 A4 with a supercharged engine and a level 5 racing tranny.
TIA
Dave
All of the rest are related to your throttlebody. Sounds like it came unplugged or has a faulty connection. check it out and get back with us.
Thread Starter
Instructor
Joined: Oct 2004
Posts: 134
Likes: 0
From: Arlington Texas
You guys will not believe what the problem ended up being. When we installed the supercharger, we had to replace the main air hose that fed the intake. The new hose was a little big, so my son cust a one and a half inch wide strip off the original hose, slid that over the throttle body and then clamped the intake hose over that. Evidently when the latest job redid the engine, the guy did not get the strip under the clamp and it vibrated off and got wedged in the throttle body valve. Luckily, it didn't go into the intake all the way. I was able to grab and pull it out. It now runs fine and all the codes went away. Of course, this was after we ran all the vacuum lines looking for leaks.
You never know.
Dave
You never know.
Dave
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Tech Contributor
Joined: Jan 2007
Posts: 19,450
Likes: 1,155
From: Dyer, IN
You guys will not believe what the problem ended up being. When we installed the supercharger, we had to replace the main air hose that fed the intake. The new hose was a little big, so my son cust a one and a half inch wide strip off the original hose, slid that over the throttle body and then clamped the intake hose over that. Evidently when the latest job redid the engine, the guy did not get the strip under the clamp and it vibrated off and got wedged in the throttle body valve. Luckily, it didn't go into the intake all the way. I was able to grab and pull it out. It now runs fine and all the codes went away. Of course, this was after we ran all the vacuum lines looking for leaks.
You never know.
Dave
You never know.
Dave
Thread Starter
Instructor
Joined: Oct 2004
Posts: 134
Likes: 0
From: Arlington Texas
The hose actually tightened down just fine without the other piece in there as a spacer. And for "BlownBlueZ06" - we are Both in Texas so that is a big hell yes to the perils of redneck engineering. We must have been drinking one two many Buds when we came up with that idea.