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400E LH module question: What is the difference between 0155453432 and 0145456332
- Thread starter Gmach
- Start date
Re: LH module question. What is the difference between 0155453432 and 0145456332
Functionally, there is no significant difference between the two. Both are 1993-vintage modules and neither have WOT enrichment, so you are giving up a little power at full throttle. Also, since they are 1993 modules designed for the 11:1 compression ration, they are not optimised for the lower-compression 1992 engine. The engine would likely run just fine with either, although ideally you'd locate a proper 1992 module if possible.
009 545 91 32 is a BM/GM power supply module, while 001 545 97 32 is a 5-cyl diesel glow plug relay... guessing there is a typo here? Assuming you meant 011-545-97-32, those also should be interchangeable, for all years 400E420.
Drew, the 021-545-70-32 is the special module with ±32% (or something like that) adaptation range, for cars affected by the bizarre DM code 19 when everything was in perfect working order. The anomaly seemed localized in certain areas of Florida, and I think this was even mentioned in the TSB. Really weird stuff. Anyway, AFAIK this 021- module doesn't have WOT enrichment. The 1992 car with this module must have been affected by the TSB.
It only affected the 4.2L engine, which was even weirder. I have the TSB in hardcopy, I need to scan it and upload to my website! Klink has some stories about this as well.
I have always wondered what the reasons were for so many updated LH part numbers?
What was improved, corrected, etc?
What was improved, corrected, etc?
It only affected the 4.2L engine, which was even weirder. I have the TSB in hardcopy, I need to scan it and upload to my website! Klink has some stories about this as well.
Ooh. In for a scan and some klink-age!
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The one obvious difference was WOT enrichment vs without enrichment. Another change was the top speed limiter; IIRC the 92-93 400E were limited to 155mph while the 94-95 were limited to 130mph due to a switch to H-rated tires. And for the W140, there was a module or two which was California-only... no clue what the deal was with that one. Other than the above obvious stuff, I'm not sure what else changed in the software between various module versions.
All these variations are really pretty interesting. Thanks for all the background info so far.
I've been thinking about the implications of running the '92 WOT LH with the later/higher compression (11.0) 4.2L. My thoughts:
It shouldn't pose any issues or danger, as the WOT feature is enriching the mixture. I think the only 'risk' with the higher compression ratio would be if it was somehow leaning out the mixture, right? IE - higher compression leads to a higher chance of detonation, as does leaning out a mixture. A combination of the two could potentially be bad.
Is that a correct interpretation/thought process?
If that is correct, has anyone peeked into lower and higher compression ratio maps see if there are any instances across the operation envelope where the higher compression maps are actually providing more fuel than the lower compression WOT maps from '92?
I've been thinking about the implications of running the '92 WOT LH with the later/higher compression (11.0) 4.2L. My thoughts:
It shouldn't pose any issues or danger, as the WOT feature is enriching the mixture. I think the only 'risk' with the higher compression ratio would be if it was somehow leaning out the mixture, right? IE - higher compression leads to a higher chance of detonation, as does leaning out a mixture. A combination of the two could potentially be bad.
Is that a correct interpretation/thought process?
If that is correct, has anyone peeked into lower and higher compression ratio maps see if there are any instances across the operation envelope where the higher compression maps are actually providing more fuel than the lower compression WOT maps from '92?
