p1448 OBII code

Did the new bypass resolve your issue with the p1448 code?

 

The valve is adjustable so I hope the working valve was free.

 

Glad to hear.

 

Labman, have you had any further issues with the CEL codes. I’m getting both 1448 and 0410 on my car. The car is idling at 700 on start up which strange. Gonna try the fuse amp first

 

generally you can hear if the valve is opening/closing Bc the engine pitch will be noticeably different. Should be an indicator if you have an issue with the valve and control mechanism (vacuum/relay/etc) or the temp probe actually detecting the exhaust coming by.

 

Thanks bcar1. It sounds like it’s working just wondering whether I’m not getting full open and closure when it’s doing so. I’ll investigate further

 

Hi Everybody, I have been fixing up my 1996 F355 Spider Motronic 5.2 with almost 20k miles on the clock. Just signed up as I've been going through a "search and see if it solves the problem" operation for about 3 months… I've seen so many similar problems on forums to my SDL light, then CEL, however, along with the similar thermoprobe error discussed here, mine showing temp too low from the right and center ones, and immediately at start up. I have the additional problem of thin white smoke at cold start, then THICK white smoke 3-5 minutes after start. The engine starts running rough, the first bank was flooded with fuel after these first problems, oil as well. Now changed ECUs thinking they were bad, after that, checked if the Motronic itself was healthy - all circuits good… I prefer not to take it out for a hard drive to see what happens as this may damage something really at the cause of the problem. Head gasket is not leaking coolant. The engine burned a liter of oil during a 30 minute drive. The car is USA market originally, have it in Europe now - I even thought the fuel octane was too high, drained it, and put in 95...still the same. Electric problem? Mechanical? I appreciate your comments. I have come to this forum as my mechanic and I are stumped… btw, it is not at a Ferrari Service, but also thinking, maybe it's time to transport it there, as maybe they have a secret switch that we don't know about?? Please help

 

"The engine burned a liter of oil during a 30 minute drive. " - that is way excessive I would do a leakdown pronto see if you have a ring or valve issue, that oil is going somewhere and in 30 minutes you will be dangerously low on oil.

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Compression test,
Leak down test,
Coolant pressure test

Post your results.

 

Is the oil overfilled?

 

+1

Who changed the oil? Did they follow the correct procedure for a dry sump car?

 

Will see if I can do this now - may be quite difficult with the engine already back in...

 

I'll definitely do a compression test and coolant pressure test. Let you know

 

Nope

 

My mechanic changed the oil. He is experienced with dry sumps. All correct procedures followed according to the workshop manual anyway… The oil level was perfect.

 

Additionally what we'll try to do now, just after receiving the Motronic 5.2 unit back in perfect condition, is bypass the thermoprobes and ECU Modules by loading around 2V direct into the Motronic. If this kills the SDL, then maybe there is a light in the tunnel… Will update

 

Compression test done. Looks healthy: Results between 11.8 and 13 bar

 

Phil -

I had the same p1448 issue back in March/April. Loading ~2v into the Motronic 5.2 will only tell you that at least 1 of 6 potential components is bad, i.e. 1 of 3 thermocouples or 3 catalytic control units. I wound up bench testing all components to isolate the culprit(s). I bought a generic K-type 5mm thermocouple for a few $ off of Amazon to act as my baseline. I then bench tested the new thermocouple with each of my CCUs and found that 1 was functioning properly (left bank), 1 was giving sporadic readings (right bank) and the 3rd CCU wasn't functioning at all (bypass). Fwiw, the non-functioning CCU had the black potting compound.

If you heat the thermocouple to the point where it just starts to glow (I used a rather unscientific propane torch), output from the CCU will be in the 2.0v-2.25v range (which is the same 2v that you're loading into the Motronic) - at least in my testing. Once I found a properly functioning CCU, I was then able to bench test all of my thermocouples, which were all functioning fine even after repeated testing for consistency.

At the end, I changed out two of my CCUs with replacements from Technistrada in New Zealand. Problem solved as I haven't had a p1448 since. Ymmv.

 

Are your oil and coolant colours/textures ok?

Just wondering what would happen if oil/coolant heat exchanger was internally damaged. If coolant gets into the oil, can it find its way into the cylinders and create white smoke?

 

Right generally white smoke coolant, blue oil. Not sure how coolant gets into cylinders but perhaps oil gets into coolant and then overflows out of expansion tank? That's a good working theory right there. Any strong odor in the engine compartment when engine gets hot?

 

Thanks for your reply, actually I just realized that i wrote that I exchanged the ECUs, but meant to write CCUs. I purchased 2 original CCUs and 1 thermoprobe (the wire to the thermoprobe was damaged/stripped and it was throwing variable amperage). After assumption of basically eliminating the bad thermoprobe and CCU problem (which basically turned out not to be the problem, the Motronic 5.2 ECU unit was sent for a check and turns out healthy. So, yes, maybe you can have a point because maybe the computer is still rejecting 2 unchanged probes and 1 CCU.

Here’s something new: new oil in, whole exhaust disconnected, turned on the engine for a cold start. No smoke at all!!! But it still flashes a SDL! Why?