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1990 Ford Crown Victoria Trouble codes 42 & 92

Tiny
JOHNHAWES
  • MEMBER
  • 1990 FORD CROWN VICTORIA
  • 5.0L
  • V8
  • 2WD
  • AUTOMATIC
  • 20 MILES
I have installed a 1990 ford 5lt 302 EFI engine in a 1941 ford with a C-4 Automatic and used a Ron Morris after market wiring harness for the ECI. The engine has been completely rebuilt and all of the sensors including the O2 sensors have been replaced. A re-manufactured ECI installed. The KOEO test has a 11 pass code, the KOER test throws 42, 92, & 75 trouble codes. Because there are no provisions for a Brake On/Off circuit, code 75, could that causing the 42 & 92 codes? And if not where should I look next. I have replaced all vacuum hoses. I also replaced the fuel pressure regulator. It has 18 inches of vacuum at idle, 165 lb. Compression on all cylinders, 40 psi static fuel pressure and 30psi running.
I can smell the rich exhaust and it is driving me nuts trying to figure out what can be causing the rich condition.
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Tuesday, April 21st, 2015 AT 3:06 PM

9 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Was the ecm reprogrammed to run without certain sensors? That can be done if not that may be the source of your problem it's looking for sensors that aren't there. The code 42 may set the 92 code as well. What is fuel pressure it should be 30-45 with engine running. 30-40 with koeo. The code 75 issue can be a faulty brake light bulb/switch or fuse. The fuel pressures seem right but the 30psi should be alittle higher I think but if you rev it up and the fuel pressure goes up then it's ok. Check to see if egr is open or partially plugged, and whether there is a vacuum leak or air leak so any grommet as well as duct work prior to engine. Also check for exhaust leaks as well. Your vacuum seem s a td low as at idle it should be around 20". The rich condition could be injectors leaking causing that if fp's are ok. I'm sending a list of things to check. Also make sure plugs are in correct firing order.
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Tuesday, April 21st, 2015 AT 3:54 PM
Tiny
JOHNHAWES
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  • 5 POSTS
As I stated the engine has been installed in a 1941 Ford with a 3 speed C-4 Transmission so there is no provision for a Brake On/Off function, after checking my diagrams I also see that there are no provisions for this circuit in the aftermarket wiring harness.
As this engine originally came out of a 25 year old car I have replaced all of the sensors; inlet air temp., Coolant temp, MAP, both O2 sensors idle control solenoid, throttle position sensor, EGR valve position sensor, and the EGR valve control switch. The distributor has a new control module, new cap, rotor, new plug wires, new champion iridium plugs, and a new coil. The fuel injectors and the fuel pressure regulator have also been replaced.
The fuel pressure is 40 psi static and 30 running which is within the set limits given in the factory manual.
The engine has been completely rebuilt with all new intake and associated manifold gaskets. All vacuum hoses have been replaced and I can find no discernable vacuum leaks.
Engine timing set as recommended by factory manual to 10 degrees BTDC with distributor sprout disconnected.
There are no exhaust leaks, engine oil has less that 1 hour operation, the tank and complete fuel system is new and clean as is the gas.
I have rechecked all system grounds and all are good, the wiring harness provides for 2 grounds for injector circuits, check ok, there are 4 other grounds in the harness that also check ok, battery grounded to engine and frame in 2 different places.
As you can see I have completed the check list that you provided with the exception of CANP which I have no idea what that means nor could I locate an explanation on the web.
If you have any more suggestions I would be most eager to hear them or any ideas you might have.
Thanks,
John
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Thursday, April 23rd, 2015 AT 3:29 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Canp is canister purge solenoid which you are not going to have, least I don't think you will. You will probably never get this code to go away without having the pcm programmed to take that part out. In other words it won't search for the brake on/off sensor. They can be done to do that and normally the charge is about $300-400. If you don't do it your computer will not go into closed loop so fuel mileage will suffer. You can see poel thatdo that in hot rod /performance magazines.
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Thursday, April 23rd, 2015 AT 3:38 PM
Tiny
JOHNHAWES
  • MEMBER
  • 5 POSTS
The purge solenoid is connected to the computer, however there are no vacuum connections or a charcoal canister. I had the solenoid so I connected it to clear the fault code. That just leaves the Brake On/Off switch circuit do you think that could be causing my problems?
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Thursday, April 23rd, 2015 AT 8:31 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
It may make the car run in open loop which is a rich exhaust. Or you could try anew fuel pressure regulator, but the code will never go away until the ecm is modified to take that circuit out so it will go into closed loop like it should. Check resistance of your injector shold be 13-16 ohms although I don't think that is the problem. Also im sending a checklist and diagram try wiring the thing for brake switch like diagram an dseeif it takes the code out. Also you might try hooking up the canister purge as it's a round container. They only work above 30 mph bu tit may take the fuel smell and richness out as well. You can hide it any place. I'll see if I can find a pic of one. You might try hooking up canister like the pic if you have aconnection at tank just run a hose there and avacuum line to solenoid it will have two connections one hose for vacuum and the other to canister then to tank or if no connection on tank try one of those little filters that will hook on to it or to open air see if that takes care o f the problems.
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Friday, April 24th, 2015 AT 7:11 AM
Tiny
JOHNHAWES
  • MEMBER
  • 5 POSTS
The engine doesn't have an air pump or any of the smog hardware and the tank has a vent hose that exhausts into the wheel well. The odor of fuel I smell is the unburned fuel in the exhaust.
From the Brake On/Off diagram it looks like a tap between the brake light switch and the lights to point LG, what is point LG. Is it in the ECM? Common sense tells me that it can't be aground as that would create a short circuit.
I have contacted Ron Francis the maker of the aftermarket wiring harness about the Brake On/Off issue but have had no response as of yet.
I really appreciate your help and insight, thanks again.
John
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Friday, April 24th, 2015 AT 7:55 AM
Tiny
HMAC300
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LG is color of wire or light green. If your tank hose is going to wheel well then hook it up to a canister, hide the canister under car and run hose through purge solenoid then it shold be ok with the fuel smell you are getting through exhaust. Just like I said in other reply
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Friday, April 24th, 2015 AT 8:00 AM
Tiny
JOHNHAWES
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  • 5 POSTS
Will installing the canister clear the 42 and 92 codes?
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Friday, April 24th, 2015 AT 1:33 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Code 42 means it's always rich and hooking up canister purge should drop that down a bit and possibly take the 92 away. It will NOT effect your performance of the engine however like how fast it goes etc. But will help with fuel /rich problem. I kind of thought you would go ahead and put the canister on and wire it up from last reply. Like isaid in first reply if code 42 is there it can cause the 92 code as well. One other thing I don't know how long the engine has run so if you can smell fuel on oil dipstick replace oil and filter.
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Friday, April 24th, 2015 AT 3:34 PM

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