LT4 Service engine light.......
Thread Starter
Race Director
Joined: Apr 2002
Posts: 17,723
Likes: 1
From: Santa Ana, Costa Rica
LT4 Service engine light.......
Question - Why with 19,000 miles would I get the service engine light?
Is there a self-diagnostic, so I can see if there is a code?
What is "USUALLY" the problem?
Can you guys help me out with this ine?
Thanks and :cheers: In advance!!
:seeya
Is there a self-diagnostic, so I can see if there is a code?
What is "USUALLY" the problem?
Can you guys help me out with this ine?
Thanks and :cheers: In advance!!
:seeya
Le Mans Master
Joined: Oct 2000
Posts: 6,199
Likes: 9
From: St. louis, MO
Re: LT4 Service engine light....... (DCTC)
The light has to do with emissions. Maybe a bad sensor. If you just got gas and did tighten the cap all the way, that can cause it to come on. Re-tighten and drive for a few on-off trips. Then clear the code out of the computer and see if it comes back on. Otherwise, you need a scanner to pull the code. Autozone can do it for free, or your mechanic should have have a scan tool to get the code.
Thread Starter
Race Director
Joined: Apr 2002
Posts: 17,723
Likes: 1
From: Santa Ana, Costa Rica
Re: LT4 Service engine light....... (Gary96LT4)
The light has to do with emissions. Maybe a bad sensor. If you just got gas and did tighten the cap all the way, that can cause it to come on. Re-tighten and drive for a few on-off trips. Then clear the code out of the computer and see if it comes back on. Otherwise, you need a scanner to pull the code. Autozone can do it for free, or your mechanic should have have a scan tool to get the code.
Thanks for the info....but how do you clear the code?......I need a vacation... :lol:
:seeya
Team Owner
Joined: Oct 2000
Posts: 29,937
Likes: 22
St. Jude Donor '03-'04
Cruise-In 1-2-3-4-5 Veteran
Re: LT4 Service engine light....... (DCTC)
DCTC,
You have to have an OBDII compatible scan tool to do code diagnostic work on 1994 and newer Corvettes...
Means hunt up a close Forum buddy that owns a scan tool or take a trip to a dealer, I think.
You have to have an OBDII compatible scan tool to do code diagnostic work on 1994 and newer Corvettes...
Means hunt up a close Forum buddy that owns a scan tool or take a trip to a dealer, I think.
Burning Brakes
Joined: Aug 2001
Posts: 797
Likes: 2
From: Westminster MD
Re: LT4 Service engine light....... (DCTC)
Something like this is only about $130 from the local auto parts store: http://www.actron.com/cgi-bin/web_st...=8308715_12009
Many parts stores will read and reset the codes as well.
It may also clear on it's own if the problem corrects itself, and you go thru enough drive cycles (i.e. turning the key on and off won't do it, but a few half hour drives might).
Many parts stores will read and reset the codes as well.
It may also clear on it's own if the problem corrects itself, and you go thru enough drive cycles (i.e. turning the key on and off won't do it, but a few half hour drives might).
Instructor
Joined: Feb 2000
Posts: 195
Likes: 0
From: Woodbridge VA
Re: LT4 Service engine light....... (TravisD)
You can clear the codes by disconnecting the battery for awhile; but buying a scantool is a must if you are going to do most of your own work. I bought a scantool off of a group purchase (gp) on the forum. Not sure if the gp is still available, but if not I'm sure there are a lot of others on the forum who still need one. Maybe a new gp could be arranged.
ZZZASY
'96LT4
ZZZASY
'96LT4
Le Mans Master
Joined: Oct 2000
Posts: 6,199
Likes: 9
From: St. louis, MO
Re: LT4 Service engine light....... (DCTC)
The light has to do with emissions. Maybe a bad sensor. If you just got gas and did tighten the cap all the way, that can cause it to come on. Re-tighten and drive for a few on-off trips. Then clear the code out of the computer and see if it comes back on. Otherwise, you need a scanner to pull the code. Autozone can do it for free, or your mechanic should have have a scan tool to get the code.
Gary...
Thanks for the info....but how do you clear the code?......I need a vacation... :lol:
:seeya
Gary...
Thanks for the info....but how do you clear the code?......I need a vacation... :lol:
:seeya
Sorry, Forgot the mention how to clear the codes. Someone already answered for me (dissconnect the battery for a minute or two).
A Scan toll is a big help working on these cars.
Good luck!! :cheers:
Thread Starter
Race Director
Joined: Apr 2002
Posts: 17,723
Likes: 1
From: Santa Ana, Costa Rica
Re: LT4 Service engine light....... (Gary96LT4)
UPDATE....................
Well, you guys were right. all I had to do was disconnect the battery for a bit and when I started it up again...No Problemo...drove it all the way to Venice and back, and smooth sailing.
Thanks for all the help guys!!!
:cheers: :cheers: :seeya
Well, you guys were right. all I had to do was disconnect the battery for a bit and when I started it up again...No Problemo...drove it all the way to Venice and back, and smooth sailing.
Thanks for all the help guys!!!
:cheers: :cheers: :seeya
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
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
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
Pro
Joined: Aug 2001
Posts: 571
Likes: 0
From: Redmond WA
Re: LT4 Service engine light....... (DCTC)
I would still pull the code, the light won't just go on for no reason and it should have stayed in memory no? I just pulled a code on mine today and found out my MAP sensor was screwed up, the car ran fine but it's better now.
Sam
Sam
Team Owner
Joined: Apr 2001
Posts: 22,267
Likes: 3
From: Dallas TX
Re: LT4 Service engine light....... (DCTC)
UPDATE....................
Well, you guys were right. all I had to do was disconnect the battery for a bit and when I started it up again...No Problemo...drove it all the way to Venice and back, and smooth sailing.
Thanks for all the help guys!!!
:cheers: :cheers: :seeya
Well, you guys were right. all I had to do was disconnect the battery for a bit and when I started it up again...No Problemo...drove it all the way to Venice and back, and smooth sailing.
Thanks for all the help guys!!!
:cheers: :cheers: :seeya
Team Owner
Joined: Oct 2000
Posts: 29,937
Likes: 22
St. Jude Donor '03-'04
Cruise-In 1-2-3-4-5 Veteran
Re: LT4 Service engine light....... (GlockLT4)
[QUOTEnormally i would say it was an EGR code from the highway, but we LT4 guys don't have EGR :D [/QUOTE]
Yeah, and your MAP sensor only backstops the MAF sensor and watches over spark control.
There's a new trick for a newbie with an LT4 - "Gotta be your EGR. Whaddya mean, it's missing?" :D :D :D
Yeah, and your MAP sensor only backstops the MAF sensor and watches over spark control.
There's a new trick for a newbie with an LT4 - "Gotta be your EGR. Whaddya mean, it's missing?" :D :D :D
