Error Codes 4121 and 4114 on Engine 5-8 348TB Help!

Nick,

Before you do anything, clean all the connections for the sensors and apply Stabilant to the contacts, then clear the codes and check if the problem is solved.

 

+1 I had the same issue after I did a engine detail. Stabilant solved it. Good luck.

 

Washing the car and letting water get into the engine compartment is an issue. I had that happen once after washing the car. Then I started covering the engine under the hood with old towels (engine cold), and avoided direct spraying of water over the engine hood as I washed the car. Pain in the a$$!

 

I wash the car with the hose sprayer set on the shower/mist setting and aim into the air above the car and let it "rain down" lightly on the car. The car is built to handle rain so this approach works fine. Never aim the hose directly at the car and use high pressure water setting. Also, I bought a cheap tarp from Walmart and used it to cover the engine bay and shut the lid down on it. The engine stays virtually dry throughout the wash.

 

Same problem here. Over aggressive hose = bad stuff.

Mine did the same thing until I pulled connectors and used CRC contact cleaner then applied Stabilant 22a.

 

exact same thing happened to me last night. the 348 is no swimmer... my light came on and dropped power about 10 mins into the drive immediately after washing. after a long drive and and a few stops and starts the car was fine. beside the light coming on and the power drop i also noticed erratic speedometer movement - has anyone had this? from this point on i will be taking the car for a good drive and covering the engine with something before washing. troy

 

Your profile doesn't list your car but a 2.7 Motronics is 142581 and a 2.5 is 141037. Apparently the problem with this part is that the engine bay temperatures eventually dry and crack the plastic housing which admits moisture and it subsequently cooks the circuitry. I think they are about $600 a piece.

 

For newbies, don't let the washing related issues dissuade you from driving the car in the rain. I have done it several times w/o any issues.

 

Hi All

I'm hanging this onto this thread since it is related.

I have a 1991 348TB Chassis ends with 000090861 and assembly number if 7749. Since it has been playing up for a while (slow down light flashing and supposedly half of the engine intermittently cutting out due to cat. control unit problems - as disussed in various threads) I saved up and bought two new ones (to be on the safe side). I ordered parts 141037 for Motronic 2.5.

When they arrived I realised that they had different plugs (4 wires instead of 6 on one cable) and, after taking out the old ones they turned out to be parts 142581 (they had serial numbers 296 and 297 or similar stamped on them - perhaps early production ones), which go with Motronic 2.7. Checking the Bosch part number on the units behoind the seats this seemed to match the M2.7 number too.

Im my 348 repair manual it states that Motronic 2.5 is used in cars from 1989 to 1993 and Motronic 2.7 from 1994. It seems so straight forward that I didn't think about checking and now have two brand new cat. control units here with nowhere to go and have had to order two more of the correct ones.

Somewhere I read that there may have been an upgrade done on post 1990 cars. Does this mean that my car was maybe upgraded back then? Is this typical?

Also, if anyone wants two brand new units for M2.5 - part number 141037 - still in their box just tell me ;-)

Regards

Mark

 

I'm betting, cracked or wet crank sensor boots. Under the car at front of engine. Changed mine out for new ones and my wet driving stumble went away. Also, invest in a gold connector kit so you are not chasing ghosts.

Helpful thread:

http://www.ferrarichat.com/forum/showthread.php?t=236698&highlight=KIA+crank+sensors

--Mike

 

Has this problem ever been solved? I'm experiencing the same, but nothing seems to do the trick...