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Old 06-01-2018, 12:09 PM   #1
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1994 Ford F53 Limp Home Mode

I have an 1994 Itasca Suncruiser with a Ford 53 chassis. I'm trying to figure out what kicks the engine into limp home mode. It happens after driving for about 45 minutes, so it's after the engine is thoroughly warmed up. If I turn off the ignition, and restart after 10 seconds or so, it resets, and the engine runs fine for a variable amount of time. Sometimes 10 minutes. Sometimes 30 minutes. The fuel pump, fuel filter, throttle position sensor, and EGR valve have been replaced. I don't have a way to get code readings. What should I look at next? I'm thinking cleaning the throttle body. The engine only has 34,000 miles, so I figured sensors made sense, especially since it resets when I turn it off and on. Thanks for any help you can offer.

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Old 06-01-2018, 12:12 PM   #2
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Instead of replacing parts and cleaning throttle bodies need to go out and spend a couple dollars and get a scan tool and see what code is causing it to go in the limp mode
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Old 06-01-2018, 12:17 PM   #3
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Crank position or Cam position sensors??

I ordered these for my 1999 V10. They are inexpensive enough to replace them as a preventative measure..
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Old 06-01-2018, 01:14 PM   #4
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Originally Posted by Waiter21 View Post
Crank position or Cam position sensors??
A 1994 F53 has a PIP sensor for that purpose.
It does not have a Crank position or Cam position sensors as such.

But as noted above you need to get a code reader and they are much cheaper than a scan tool.
INNOVA 3145 Ford Digital OBD1 Code Reader and is only $22.51 at Amazon.
AND not much more at an auto parts store.
https://www.amazon.com/INNOVA-3145-F...de+reader+obd1



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Old 06-04-2018, 07:27 AM   #5
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Quote:
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A 1994 F53 has a PIP sensor for that purpose.
It does not have a Crank position or Cam position sensors as such.

But as noted above you need to get a code reader and they are much cheaper than a scan tool.
INNOVA 3145 Ford Digital OBD1 Code Reader and is only $22.51 at Amazon.
AND not much more at an auto parts store.
https://www.amazon.com/INNOVA-3145-F...de+reader+obd1



/
I didn't know this was something I could get for so cheap, thanks! I ordered one today. I will post back once I get a code.

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Old 06-04-2018, 08:36 AM   #6
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You should buy a code reader or if you know someone with a 5 Star tuner the device will both read and clear codes...done so on my buddy's F53 and my Prius.
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Old 06-04-2018, 12:09 PM   #7
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I don't have a way to get code readings.
Here is a way to read the codes for the cost of a paperclip. https://www.troublecodes.net/ford/

If you don't read the codes the only way to fix this is to keep buying and installing new parts until you get lucky. Chances are you'll luck into finding the right part in the first few thousand dollars.
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Old 06-04-2018, 12:17 PM   #8
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The engine really doesn't have a limp home mode, if you mean a low performance run mode. It can substitute sensors, so if a MAP sensor fails, it will use TPS instead and keep running, but all these failures would set codes.

This ECU can have codes without setting the MIL (check engine) light.


The transmission can be made to select some gears with no electronic control, but I think you're complaining about engine power.


The most important thing that the engine needs which does NOT directly set a code is fuel pressure, so get yourself a fuel pressure tester that can be read while driving the vehicle.


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Old 06-04-2018, 01:23 PM   #9
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You should buy a code reader or if you know someone with a 5 Star tuner the device will both read and clear codes...done so on my buddy's F53 and my Prius.
A 5 Star tuner will not work with a 1994 F53.
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Old 06-05-2018, 04:49 AM   #10
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A 1994 F53 is going to have an OBD 1 based system with a V8 engine. Very different critter than the V10 we're all used too. Might even be throttle body fuel injection along with a distributor based ignition.

Even with the limit fault code capability of the first generation OBD give a reader a try.
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Old 06-05-2018, 05:57 AM   #11
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Plugged catalytic converter ?

Hook a vacuum gauge to the engine and take it for a ride.

Watch the vacuum gauge as it starts to die. If the vacuum goes high, with it floored, there is a restriction.
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Old 06-05-2018, 06:32 AM   #12
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Plugged catalytic converter ?

Hook a vacuum gauge to the engine and take it for a ride.

Watch the vacuum gauge as it starts to die. If the vacuum goes high, with it floored, there is a restriction.
No catalytic converter on a 94. At least not on one with a GVWR over 14,000 lbs, which I think applies to all the F53 chassis.


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Old 06-05-2018, 07:22 AM   #13
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No catalytic converter on a 94. At least not on one with a GVWR over 14,000 lbs, which I think applies to all the F53 chassis.


Michael
OK, but the vacuum check also checks for restricted exhaust system. Mufflers have been know to come apart, internally.
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Old 06-05-2018, 07:52 AM   #14
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As noted above the so called limp mode is for the Transmission and not the engine or the how the engine runs.
Also the 1994 F53 fuel system is MFI and not throttle body fuel injection.
Yes it is a Distributor type system.

The extension cable for the above reader makes it much more easy to use.
If the code reader gives a Limp Mode code it will also have another code that caused the Limp Mode in the CM (Continuous Memory) part of the read out.


Attached in PDF is an explanation of the Transmission Limp Mode.
Attached Files
File Type: pdf Limp Mode.pdf (73.1 KB, 56 views)
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