: Engine missing



avemaria
04-08-09, 07:56 AM
Hi all,

I took my '96 FWB with 100k miles out for its first spring ride, it ran great until I got home. Pulling into the garage the engine started to miss and the check engine light came on. I turned off the ignition, engine would crank but wouldn't fire. Left it sit until cold, started but still missing.

How do I start to diagnosis the problem? Help much appreciated and happy Easter to all.

Lazarus_Rooney
04-08-09, 04:40 PM
this may sound kinda dumb but my 90 brougham had a similar problem that would crop up occasionaly. had me baffled until i looked at my ignition system and the distributor cap was loose. i just popped it back on and it hasnt missed since.

jayoldschool
04-08-09, 04:48 PM
Well, it isn't going to be as easy as a loose distributor cap, since the 96 uses the Optispark that is mounted under the water pump.

So... let's talk about possible causes. First, you need to pull that code to see if we can get an idea of what is causing the misfire.

Here is what may be causing the misfire:
- coil wire
- coil
- wires going to the coil
- water pump leaking on the opti
- spark plug
- spark plug wire
- optispark
- fuel injector
- fuel pump

Do a quick check of the fuses in the fuse box under the hood. There are two for the injectors. One for the right bank and one for the left. I believe they are 3 amp each. If one blows, the car will still run, but REALLY rough. The injection system switches from MPFI to batch fire. I had this happen on my SS after a wiring short on my headers. I couldn't rev over 3000, and couldn't get the car over about 40mph. It might be one of those fuses... easy to check, too...

A failing fuel pump will also produce the symptoms you are experiencing.

It is either ignition or fuel. Keep the info coming. We'll figure it out!

arnauts
04-09-09, 01:19 AM
You can access a very comperhensive onboard diagnostic trouble code system through your climate control. This is a Fleetwood only feature, and does not apply to other similar vehicles. This was extremly helpful for me when I was trying to figure out why my SES light was on.

A cute feature with this system is that you can actually access a Tach, alternate speedos, and coolant tempreture guages also.


-----------------------------------
Your Cadillac is equipped with a very good on-board diagnostic system capable of reading out the stored trouble codes.

To enter diagnotic mode:
With the ignition in the "RUN" position (engine does not necessarily need to be running, but it will work either way).
Push (and hold) "OFF" and "WARMER" simultaneously on the Electronic Climate Control (ECC) until all telltales lights illuminate (segment check).
Release the "OFF" and "WARMER" buttons.
System is now in diagnostic mode. "00" (zero-zero) should now be displayed. This is the pointer.
Pressing "OUTSIDE TEMP" will allow you to display the corresponding code for the pointer.
Use the "FAN SPEED" override switch (UP/DOWN) to increment or decrement the pointer number.
Pressing "AUTO" or turning the ignition switch "OFF" exits diagnotic mode.

Pointers 00-04 contain the stored trouble codes.
"00" = Powertrain Control Module (PCM) codes
"01" = Central Control Module (CCM) codes
"02" = Heating, Ventilation and Air-Conditioning (HVAC) codes
"03" = Supplemental Inflatable Restraint (SIR) codes
"04" = Anti-lock Brake/Traction Control System (ABS/TC) Codes

Codes prefixed by a "1" are history codes.

A code can be cleared by pressing the "OFF" button while that particular code is being displayed.

1993 5.7L Throttle Body Injection, VIN 7
1994-1995-1996 5.7L Fuel Injection, VIN P

Powertrain Control Module (PCM) Codes
Code Description
00-11 ........................................ Malfunction Indicator Lamp (MIL) circuit
00-13 ....................................... Heated Oxygen sensor voltage out of range
00-14 ........ Coolant temperature sensor signal indicates excessively high temperature
00-15 ......... Coolant temperature sensor signal indicates abnormally cold temperature
00-16 ............................ Distributor low resolution pulse not received by ECM
00-18 .................................. Injector driver circuit voltage to PCM problem
00-21 .................................................. ...... TPS high voltage problem
00-22 .................................................. ....... TPS low voltage problem
00-23 ...................... Inlet air temperature sensor indicates low air temperature
00-24 ........................................... Throttle position angle problem (VSS)
00-25 ............... Inlet air temperature (IAT) sensor indicates high air temperature
00-26 ................... ECM detected wrong potential voltage at #1 quad-driver module
00-27 ................... ECM detected wrong potential voltage at #2 quad-driver module
00-28 ................... ECM detected wrong potential voltage at #3 quad-driver module
00-29 .......................... Secondary air injection pump circuit voltage was wrong
00-31 .................. Cam pulse missing on first pass through internal ECM self test
00-32 .......... EGR open command did not change fuel mixture during off idle operation
00-33 ............................. MAP sensor signal voltage was too high (low vacuum)
00-34 ............................. MAP sensor signal voltage was too low (high vacuum)
00-35 ........................................... MAP sensor signal showed a low vacuum
00-36 ........................................... ECM timing pulse/low resolution pulse
00-37 .................................................. .......... Brake swith stuck ON
00-38 .................................................. ......... Brake swith stuck OFF
00-41 .................................................. ...... EST circuit high voltage
00-42 .................................................. .... PCM did not detect any EST
00-43 .......................... One or both knock sensors were either open or grounded
00-44 ....................... Left oxygen sensor under voltages (closed loop operation)
00-45 ......................... Left oxygen sensor over voltage (closed loop operation)
00-46 ............................................ Anti-Theft Pass Key signal was wrong
00-47 ............................................. Knock sensor signal was not present
00-48 ............................................... No MAF signal with engine running
00-50 .................................. PCM detected an ignition low voltage condition
00-51 .................................................. ....... Programmed EEPROM error
00-52 ............................................. Engine oil low temperature detected
00-53 ................................... ECM detected a battery high voltage condition
00-54 ......................................... Fuel pump system voltage problem (high)
00-55 .................... ECM detected lean oxygen sensor during power enrichment mode
00-56 .............................................. Vacuum sensor voltage out of range
00-58 ............ Transmission Fluid Temperature sensor circuit low (high temperature)
00-59 ............ Transmission Fluid Temperature sensor circuit high (low temperature)
00-61 ................ Vacuum sensor voltage problem with secondary port throttle valve
00-62 ............................................ Engine oil high temperature detected
00-63 .................................................. ... Right oxygen sensor problem
00-64 ................. Right oxygen sensor low voltage problem (closed loop operation)
00-65 ................ Right oxygen sensor high voltage problem (closed loop operation)
00-66 ..................................... A/C pressure sensor circuit open or shorted
00-67 ........ ECM did not detect an A/C system pressure change with A/C clutch engaged
00-68 ....... ECM detects voltage on A/C status line after ECM disengaged the A/C relay
00-69 ........ ECM did not detect voltage on A/C status line after ECM commanded A/C ON
00-70 .............. A/C clutch relay circuit showed incorrect potential voltage at PCM
00-72 ........... Transmission output speed changed with vehicle was in park or neutral
00-73 ............................... Pressure control solenoid return amperage problem
00-74 ........... Traction control system active signal with vehicle in park or neutral
00-75 ........................... Ignition low voltage with engine speed above 1000 RPM
00-77 .................. Cooling fan relay #1 control potential voltage incorrect (PCM)
00-78 ........... Cooling fan relay #2 and #3 control potential voltage incorrect (PCM)
00-79 ............. Transmission fluid temperature signal indicates high temp condition
00-81 ......................................... Transmission 2-3 shift solenoid problem
00-82 ......................................... Transmission 1-2 shift solenoid problem
00-83 .................................................. TCC PWM solenoid circuit fault
00-84 ......................................... Transmission 3-2 shift solenoid problem
00-85 ................................. TCC solenoid problem after commanded OFF by PCM
00-90 .................................................. .... TCC solenoid circuit fault
00-91 ............... One to Four up-shift lamp control signal showed incorrect voltage
00-95 .................................................. ....... Change oil lamp circuit
00-96 .................................................. .......... Low oil lamp circuit
00-97 ............................... VSS output signal showed incorrect voltage at PCM
00-98 .............................. Tach output signal showed incorrect voltage at PCM

Central Control Module (CCM) Codes
Code Description
01-20 ................ Retained Accessory Power (RAP) enable circuit shorted to battery
01-21 ......... Retained Accessory Power (RAP) enable circuit open or shorted to ground
01-22 .................. Delayed Interior Light (DIL) enable circuit shorted to battery
01-23 ........... Delayed Interior Light (DIL) enable circuit open or shorted to ground
01-24 ...................................... Courtesy output circuit shorted to battery
01-25 ............................... Courtesy output circuit open or shorted to ground
01-26 ......... Variable Effort Steering (VES) output circuit open or shorted to ground
01-27 ........................................... VES output circuit shorted to battery
01-28 ............................................ VES tracking error (open or shorted)
01-30 .............................. PASS key fault telltale circuit shorted to battery
01-31 ....................... PASS key fault telltale circuit open or shorted to ground
01-32 .......................................... Fuel enable circuit shorted to battery
01-33 ................................... Fuel enable circuit open or shorted to ground
01-34 ...................................... Headlamp enable circuit shorted to battery
01-35 .................................. Parking lamp enable circuit shorted to battery
01-36 ................... Daytime Running Lamps (DRL) enable circuit shorted to battery
01-37 ............ Daytime Running Lamps (DRL) enable circuit open or shorted to ground
01-40 ......................... Delay pot circuit shorted to ground (Twilight Sentinel)
01-41 ................ Delay pot circuit open or shorted to battery (Twilight Sentinel)
01-42 .......................................... Key resistor circuit shorted to ground
01-43 ................................. Key resistor circuit open or shorted to battery
01-44 ......................... Steering wheel sensor circuit open or shorted to ground
01-45 ........................ Steering wheel sensor circuit open or shorted to battery
01-46 .................................................. .......... CCM Internal Failure
01-47 .................................................. ... Canadian Select Input Error

dirt_cheap_fleetwood
04-09-09, 11:50 AM
You can access a very comperhensive onboard diagnostic trouble code system through your climate control. This is a Fleetwood only feature, and does not apply to other similar vehicles. This was extremly helpful for me when I was trying to figure out why my SES light was on.

You can do this with the DeVilles as well. My '88 has this feature and I have used it many times. If you get yourself a FSM they have nice diagrams that make it very easy to work your way through the menus to get the data you want.