Cold start misfires. I think this is more serious than I thought!

[Kmorpheus]

All would be my call. You need to make sure they all are within the tolerences. Pull one test replace plug move to next, repeat. I don't think its necessary for the car to start just having the engine turn over should be enough.

[usa1camaro1969]

Have you had the problem a while? I mean have you run different tanks of fuel through it? I was having probably the same issue as you late last fall and swapped from the e85 back to the 91oct and it went away as soon as I got good gasoline in it. I'd take her on a roadtrip and get all remnants out and new fuel back in.

I also had my nitrous plugs in it(colder heat range and e85 didn't seem to like each other as much on start-up) and swapped back to stock. Checking your plugs if you're running e85 is going to be fun as there's even less deposits.

I have been contemplating going back to the e85 already(we've seen some really warm days already) but the early morning starts were rough. Sometimes I thought I had a piston or rod coming apart.

Compression test is done with the engine in a non-start mode. We would unhook the coil and turn the engine over to get a reading.

[bmorecam]

I never had this problem before. Even with e85's back fire and bucking didn't cause any misfire CEL like it has caused for me lately. This problem started happening a little after I been running the new test tune. Same 93 gas I been using since last year without any issue. I doubt its bad gas. I guess I will know for sure tomorrow when I check the plugs and compression to see if too much timing and cylinder compression burned out my valves or damaged my cylinder walls.

So it really doesn't matter if I unplug all the spark plugs or just do one at a time as long as the coils are unhooked and not startable right? how many times should I crank?

thanks Paul/kmorph.

[OOLIE]

Well I don't have the expertise to help you I am sorry to say, but I really hope it is something simple we can all learn from.

Good luck man!!

[bmorecam]

Originally Posted by OOLIE

Well I don't have the expertise to help you I am sorry to say, but I really hope it is something simple we can all learn from.

Good luck man!!

I hope so. I tell you this much tho..I haven't had a cel all day today and the car started just fine but its been a little warmer today so not sure its because of that or the fuel system cleaner. The cold start been a little choppy tho. I just hope my compression test come back normal. Whatever the case might be I will get to the bottom of this.

[ChadG]

Bmore this sucks big time . . . I wish I had a constructive suggestion but if you need someone nearby to help with something let me know.

[bmorecam]

Thanks alot Chad, I really appreciate the offer and I sure will keep that in mind

Sooo.... I just seen that video usa1 posted and do I really have to unhook the fuel pump relay and leave the throttle blade wide open? I don't remember compression test being done this way

I thought I just unhook the coils and start testing each cylinder.

Someone please give me a run down on the proper procedure to do this on this car.

[bmorecam]

nevermind..my neighbor just went through the correct process with me on doing the compression test. What do you do without your good ol neighbors lol

So...I just need to know which fuse I need to pull to disable the fuel injectors. Once I can get that info I will be set.

Anyone know which fuse or fuses I need to pull to disable the fuel injectors?

[Blade]

Originally Posted by bmorecam

nevermind..my neighbor just went through the correct process with me on doing the compression test. What do you do without your good ol neighbors lol

So...I just need to know which fuse I need to pull to disable the fuel injectors. Once I can get that info I will be set.

Anyone know which fuse or fuses I need to pull to disable the fuel injectors?

Flip the fuse box panel either in the engine bay, or on the driver side panel left of the steering column. Each cover has a map of what fuse does what....that will probably tell ya

[bmorecam]

so I found this www.*************/forum/viewtopic.php?f=21&t=564 (bow and tie 6)and who knew there was a fuse box in the trunk lol.

so im thinking fuel system module in the trunk and fuel injector even and odd under the hood?

[TJ91]

Originally Posted by bmorecam

so I found this www.*************/forum/viewtopic.php?f=21&t=564 (bow and tie 6)and who knew there was a fuse box in the trunk lol.

so im thinking fuel system module in the trunk and fuel injector even and odd under the hood?

wow they went to a whole new level blocking that site.
And hmmm wish I could help you man but I dont know anything in this area. Hopefully someone chimes in quick!

[BaylorCamaro]

Wow Jay sorry to hear this, I hope you get everything figured out.

[bmorecam]

thanks TJ and Chris. Hopefully the cr test come back fine today (fingers crossed).

[bmorecam]

about to go out here and check the plugs and do a compression check in about an hour and see where my faith lie ahead but I need to make sure that I am pulling the correct fuse to disable the fuel injectors. Can anyone confirm which fuse would be the correct fuse to pull??

I'm thinking mini fuse #9 fuel injectors even and #10 for fuel injectors odd or... do I just pull the #F15 fuel system module in the trunk??

Engine compartment location

J Case fuses

Fuse 6 Wiper
Fuse 12 Starter
Fuse 22 Brake Vacuum Pump
Fuse 25 Power Windows Rear
Fuse 26 Power Windows Front
Fuse 27 Rear Defog
Fuse 41 Cooling Fan High
Fuse 42 Front Heater, Ventilation and Air Conditioning
Fuse 43 Antilock Brake System Pump
Fuse 44 Cooling Fan Low

Mini Fuses Usage

Fuse 1 Air Conditioning Compressor Clutch
Fuse 2 Transmission Control Module
Fuse 5 Engine Control Module Main
Fuse 7 Pre-Catalytic Converter Oxygen Sensor
Fuse 8 Post-Catalytic Converter Oxygen Sensor
Fuse 9 Fuel Injectors - Even
Fuse 10 Fuel Injectors - Odd
Fuse 11 Cooling Fan Relay
Fuse 14 Manifold Air Flow/Chassis Control
Fuse 15 Ignition
Fuse 16 Run/Crank IP
Fuse 17 Sensing Diagnostic Module/Ignition
Fuse 18 Run/Crank Body
Fuse 19 Transmission Control Module/Ignition
Fuse 20 Engine Control Module/Ignition
Fuse 31 Outside Rear View Mirror
Fuse 32 Canister Vent Solenoid
Fuse 33 Body Control Module #6
Fuse 34 Sunroof
Fuse 35 Front Heated Seats
Fuse 38 Washer Pump Front
Fuse 40 Antilock Brake System Valves
Fuse 46 HID Headlamp - Left Front
Fuse 47 HID Headlamp - Right Front
Fuse 50 Fog Lamps
Fuse 51 Horn
Fuse 52 Spare
Fuse 55 High Beam Headlamp - Right Front
Fuse 56 High Beam Headlamp -Left Front
Fuse 61 Heated Mirror

Mini Relays Usage

Relay K26 Powertrain
Relay K50 Run / Crank
Relay K55 Rear Defog
Relay K612 Cooling Fan High
Relay K614 Cooling Fan Control
Micro Relays Usage
Relay K61 Starter
Relay K69 Wiper Control
Relay K613 Cooling Fan Low
Relay K617 Air Conditioning Compressor Clutch
Relay K619 Wiper Speed
Relay K627 High Intensity Discharge Headlamps
Relay K632 Brake Vacuum Pump

Side of the dash board location

Fuses Usage

F1 Discrete Logic Ignition Switch
F2 Diagnostic Link Connector
F3 Airbag
F4 Cluster
F5 Heating Ventilation Air Conditioning Controller
F6 Body Control Module
F8 Battery
F9 Spare
F10 Spare
F11 Not Used
F12 Spare
F13 Display
F14 OnStar® Universal Hands Free Phone
F15 Body Control Module 3
F16 Body Control Module 4
F17 Power Outlet 1
F18 Power Outlet 2
F19 Steering Wheel Controls Backlight
F20 Spare
F21 Spare
F22 Not Used
F23 Trunk
F24 Automatic Occupant Sensing
F25 Body Control Module 1
F27 Body Control Module 8
F28 Spare
F29 Body Control Module 5
F30 Body Control Module 7

Circuit Breakers Usage

CB7 Passenger Seat
CB26 Driver Seat

Relays Usage

K10 Retained Accessory Power
K605 Not Used
K609 Trunk

Trunk location

Fuses Usage
F1 Universal Garage Door Opener/Ultra-sonic Reverse Parking Aid
F2 Amplifier
F3 Radio
F4 Spare
F5 Convertible Top 1
F6 Convertible Top 2
F7 Spare
F8 Spare
F9 Spare
F10 Spare
F11 Spare
F12 Spare
F13 Engine Control Module/Battery
F14 Regulated Voltage Control
F15 Fuel System Control Module
F16 Spare
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