Question about 1996 Ford Ranger SuperCab

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96 ford ranger 3.0 runs perfect for several days then goes into limp mode and starts flooding and has low engine vacume. when i try to run the codes i get err on my obd 11 scanner. after so many starts it runs perfect again. when its in limp mode you can unplug mass flow or tps with no effect. when its not in limp mode and i run the codes i get downstream o2 sensor. I replaced it with no change in running condition.

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  • David Sharp May 11, 2010

    sounds like a bad ecm . Do you have your 5 volts reference and ground on sensors and ecm

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I suspect an inturption on fuel supply,go back in to the fuel supply ,check fuel filter even into the tank and check for contamation in the tank.adrian;;;;

Posted on Nov 12, 2009

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Nissan primera 2005 1.8 sx goes limp mode at night with lights and wipers on. No measurable battery or charger problems. Switch off lights and the problem goes away instantly.


The only thing these components have in common is the ground wires. There are many grounds on a vehicle. But the main three are the battery to body, battery to engine and engine to body. These are fairly large wires/cables. They should be checked with an ohm meter. I replace or repair any wires that have more than 5.0 ohms of resistance.

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the ECM puts the car in limp mode to prevent serious problems in the engine or transmission
could be no coolant, sump oil , transmission oil etc
run the fault codes and find the reason for the mode

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Why does my van keep going onto limp mode '


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Feb 06, 2015 | Chrysler Cars & Trucks

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P0380


I am not well versed on this unknown engine, but here is something to think about. If you look at the appropriate circuit scheme, there must be a part that controls your Maximum RPM. The Limp Mode is suppose to reduce RPM and Diesels do run at lower RPM than gas engines. Often an engine goes into LIMP when it senses overheating. On some engines, cylinders are deactivated and the dead cylinders are turned into cooling pumps.

Puzzling is the Glowplug warning. This can mean you have a dead short in some glowplugs. This easily can explain starting problems, but your engine will heat the glowplugs for probably 2 minutes or less and then they are off for a cold motor. Even restarting the engine when it is hot will not activate the glowplugs. So I can't see the glowplug problem causing a Limp Mode once you are underway.

It could be engineered to work this way though, and you need to refine the info about the Year, Model, and engine size.

I think I would try to change a temperature sensor, and pull the glowplugs out and test them.

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1 Answer

Hi i have an audi a6 1.9tdi with the awx engine in it it keeps going into limp mode there is no air leaks ive read the codes and it say says turbo over boost? new egr, you can see the actuvator arm move...


In your case the turbocharger is responsible for engine losing power.
The car goes in "limp home" mode!!!
After scan the EDC-15P engine control unit with a VAG or KTS -BOSCH diagnosis tool you will find this: Fault code: P1557-Turbo Boost pressure control exceeded
1. Engine stopped and ignition switch off. Check all pneumatic connections and hoses between turbocharger actuator = pressure unit for boost-pressure control, boost-pressure control solenoid valve, vacuum reservoir, EGR control solenoid valve, intake-manifold flap solenoid valve, EGR valve with throttle - part of intake manifold. Also the vacuum connection between tandem pump and brake booster. If you find something wrong replace parts. If not go to step 2.
2. Extract the hose of the turbocharger actuator = pressure unit for boost-pressure control part of turbocharger. Instead of the original hose you must place another 1 meter long hose with the same inside diameter, and then you check to inspire yourself the air from the other one extremity of this hose. The mechanical connecting rod of the turbocharger actuator must have a smooth and whole motion. If you can do that with your mouth, then you must replace the boost-pressure control solenoid valve. If you can not reach this with your mouth, then you go to step 3.
3. This is the most difficult work. The problem is that the soot particles deposits inside the turbocharger plugging the variable nozzle geometry mechanism = adjustable vanes of the turbine. If the turbocharger actuator is not able to adjust the turbine vanes the charge air pressure increase too much and ECU (engine control unit) go in "limp mode" = engine protection software. As a result the "limp home" mode engine still running until you turn the engine off (ignition switch off) and back on when the "limp mode" is deactivated, but the fault still remain in ECU memory!
4. You must be able to extract the turbo from the engine and then to disassemble the turbocharger, clean inside adjustable vanes mechanism and refit all.

Jan 14, 2011 | Audi A6 Cars & Trucks

2 Answers

Ck engine light , p1107 code reading ,cant find any vacum leak? olds 88 96 model 3.8 liter.


a3342: Your code is for map sensor intermittent low voltage.
This car has on board diagnostic capabilities which is what AllDATA recommends doing first.

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96 ford taurus


ask previous owner...must have been the problem why he change it

Aug 31, 2008 | 1999 Ford Taurus

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