Project 96 LT4
Thread Starter
Instructor
Joined: Jul 2015
Posts: 187
Likes: 4
From: West Plano Tx
Ohm Tested and Pulled Valve Covers to inspect rockers
Ohm tested injectors, they tested at 12 ohms.
Pulled valve covers and checked rockers. They looked good to me. I am going to rule out mechanical and now start really looking at vacuum and spark at the opti.
I seem to really be looking at everything on this car.
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Pulled valve covers and checked rockers. They looked good to me. I am going to rule out mechanical and now start really looking at vacuum and spark at the opti.
I seem to really be looking at everything on this car.
[ATTACH]
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Thread Starter
Instructor
Joined: Jul 2015
Posts: 187
Likes: 4
From: West Plano Tx
Update. I found out that the Opti Vent Hose on the Air Intake of the opti (Metal part) is hooked up to the intake plenum by the PCV. This is wrong the vent hose should come from right after the MAF but before the throttle body and then go into the opti. The other hose that goes on the Rotor Cap (Plastic) of the Opti should go into the intake plenum by the PCV. I am going to Fab a hose after Thanksgiving and pull out the opti to inspect it. I have a feeling this is what is causing the misfire. Oh well what's another 4 hours of my time.
Oil Producer
Joined: Apr 2014
Posts: 9,371
Likes: 2,736
Update. I found out that the Opti Vent Hose on the Air Intake of the opti (Metal part) is hooked up to the intake plenum by the PCV. This is wrong the vent hose should come from right after the MAF but before the throttle body and then go into the opti. The other hose that goes on the Rotor Cap (Plastic) of the Opti should go into the intake plenum by the PCV. I am going to Fab a hose after Thanksgiving and pull out the opti to inspect it. I have a feeling this is what is causing the misfire. Oh well what's another 4 hours of my time.
think of the rip your face off joyride you can have when u get it licked!
Burning Brakes
Joined: Oct 2001
Posts: 911
Likes: 5
From: TN
old gas
History of the car is that it has been sitting for a while. I am going to guess almost 2 years just from looking at the receipts for work done.
Work done.
The opti was supposedly changed a year ago, but I see that the opti vent hose is not hooked up. Plug wires look newer. I need to pull plugs to see how they look.
I was told gas was old. Fuel tank is almost empty.
Plan is to siphon out gas to inspect and pressure test fuel system at shrader valve.
Jack up car and inspect 02 sensor connections, and knock sensors.
Check ICM, do Optispark testing and hope for the best.
She idles a little rough and I need to fix these items to get inspected.
The other thing is I am going to rebuild the steering column since the tilt is broken and may be causing ignition switch to malfunction. Car sometimes has a hard time turning off when key is turned to off position. When I readjust tilt it works.
Washed car last night and can tell it going to need a clay job and good polish and wax!
Any tips/advice are greatly welcomed. I followed Chstitan42 s post on his 96 LT4 and I am hoping it is not the opti but hey you never know.
Current Fault Log
------------------
P0141: O2 Sensor Heater Circuit (Bank 1 Sensor 2)
P0161: O2 Sensor Heater Circuit (Bank 2 Sensor 2)
P0300: Random/Multiple Cylinder Misfire Detected
Last edited by 70ZZ3 96LT4; Nov 24, 2016 at 01:35 PM.
Burning Brakes
Joined: Oct 2001
Posts: 911
Likes: 5
From: TN
fuel filter
I would change all of the o2s and while under there pull the fuel filter and key it on till you empty the tank out the fuel line. Then a new filter and fuel then warm it up and do a oil change then drive it gently for a while. For the tilt there is a over sized bolt you can buy to fix this most of the time with just doing the left one. Looks like you're hooked on vettes. 
