LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

Buddies car pulled 10 codes tonight, need someone to help clarify them!

Thread Tools
 
Search this Thread
 
Old Nov 21, 2004 | 11:35 PM
  #1  
BlackLT1_TX's Avatar
Thread Starter
Registered User
 
Joined: Apr 2003
Posts: 892
From: Dallas/Fort Worth
Buddies car pulled 10 codes tonight, need someone to help clarify them!

It pulled:

MAF VAT code
4 O2 codes, inop and heating malfunction
Right bank lean
Left bank lean
EGR malfunction
and Random Multiple Misfire

He's had a SES for a while, but now the motor will stay rev'ed up when he puts the clutch in, and will actually continue to rise a lil. When he hits the gas and lets off with it in nuetral it will help bring the RPM's down.

We tried putting my T/B on it just incase it was TPS or IAC before we had it scanned, but it didnt help.

Let me know what you guys think!

PS, his car is a 96 T/A ODBII
Old Nov 22, 2004 | 05:29 AM
  #2  
slopokrodrigez's Avatar
Registered User
 
Joined: May 2003
Posts: 2,275
Re: Buddies car pulled 10 codes tonight, need someone to help clarify them!

Assuming he hasn't been doing anything to the car lately and it worked fine not too long ago. More than likely the alternator is bad. Get a digital volt meter and set it to AC. While the engine is running, put one probe on the negative battery terminal and the other on the output post of the alternator. It should not be over 0.03 VAC. If it is, the diodes in the alternator are bad and allowing AC voltage on to the DC line. This drives the PCM wacky and at that point, the PCM could do anything.

Also check the DC condition of the battery with the engine running. The DC voltage across the battery should be close to 14 volts. If the battery where the problem however, it would have to be less than 11 volts and at that point it would crank the engine over very slowly if at all.

Good luck
Dave
Old Nov 22, 2004 | 05:44 AM
  #3  
RE AND CHERYL's Avatar
Registered User
 
Joined: Oct 2003
Posts: 2,140
From: DOVER DE
Re: Buddies car pulled 10 codes tonight, need someone to help clarify them!

Assuming you have no alternator problems. I would start by replacing your O2 sensors. You might also have a problem with the Mass Air flow sensor. Try replacing the O2 sensors and swap the MAF from your car.
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
ModdedNerd
General 1967-2002 F-Body Tech
4
Jan 1, 2015 10:56 AM
Red97LT1
Suspension, Chassis, and Brakes
9
Dec 17, 2014 06:13 PM
ModdedNerd
General 1967-2002 F-Body Tech
10
Dec 10, 2014 08:42 PM
USAirman93
General 1967-2002 F-Body Tech
4
Nov 24, 2014 03:37 PM
sleeperZ96BT
LT1 Based Engine Tech
300
Jun 5, 2005 09:33 PM




All times are GMT -5. The time now is 07:03 AM.