Little big mack Posted October 30, 2017 Share Posted October 30, 2017 Hopefully you can help me out. Boost pressure wont build over 30lbs on aset 460. Do see the turbo speed sensor green wire has some wear through but i wrapped in electrical tape for time being. Not throwing any codes tho. But the reason im asking is i have a 3-2 code with if you push mode and reset at same time on dash is 5022-02 m128. Code means engine speed sensor but which one. I just replace both 2months ago and i only have one spare and hoping its not the bellhousing bc its a bitch. Also can it feel like truck is in limp mode. Still kinda new at understanding mack.but im some mechanically inclined Quote Link to comment https://www.bigmacktrucks.com/topic/51543-code-problem/ Share on other sites More sharing options...
Mackpro Posted October 30, 2017 Share Posted October 30, 2017 Your 3-2 code with the FMI of 2 is data erratic on the timing sensor which is on the side of the flywheel housing. Check the sensor tip for damage and the wiring harness end connector. The 3-4 code is the cam timing sensor on the front cover. Both sensors have the same part number Quote Link to comment https://www.bigmacktrucks.com/topic/51543-code-problem/#findComment-383831 Share on other sites More sharing options...
Little big mack Posted October 31, 2017 Author Share Posted October 31, 2017 Thank you mackpro. I had a feeling you were going to say that. Just put new clutch and resurfaced flywheel. But didnt touch the sensor with anything other than wiping old grease out Quote Link to comment https://www.bigmacktrucks.com/topic/51543-code-problem/#findComment-383901 Share on other sites More sharing options...
carlotpilot Posted October 31, 2017 Share Posted October 31, 2017 would small metal particles picked up in a grease rag and wiped onto the sensor cause it to throw codes? Quote Link to comment https://www.bigmacktrucks.com/topic/51543-code-problem/#findComment-383903 Share on other sites More sharing options...
Little big mack Posted October 31, 2017 Author Share Posted October 31, 2017 Forgot to mention installed new trans and new sensor on tail shaft of tranny. Could that sensor be off a tad bit bc the old one broke trying to take off old tranny Quote Link to comment https://www.bigmacktrucks.com/topic/51543-code-problem/#findComment-383913 Share on other sites More sharing options...
Mackpro Posted October 31, 2017 Share Posted October 31, 2017 Most guys leave the sensor in when R&R a flywheel. It's easy to hit the sensor when installing the flywheel. I've seen clutch brakes come apart and bounce around and tear up sensors but that's mostly on the MP engines Quote Link to comment https://www.bigmacktrucks.com/topic/51543-code-problem/#findComment-383914 Share on other sites More sharing options...
Mackpro Posted October 31, 2017 Share Posted October 31, 2017 2 minutes ago, Little big mack said: Forgot to mention installed new trans and new sensor on tail shaft of tranny. Could that sensor be off a tad bit bc the old one broke trying to take off old tranny That would be a speedometer fault if that wasn't set correctly. I have seen your 3-2 code active with key on/engine off but once Engine started codes goes inactive Quote Link to comment https://www.bigmacktrucks.com/topic/51543-code-problem/#findComment-383916 Share on other sites More sharing options...
Little big mack Posted October 31, 2017 Author Share Posted October 31, 2017 Mines doing it with engine running when i push on the decel button and key in on position. Takes alittle longer to start maybe 5 seconds instead of the first 3 or 4 roll overs Quote Link to comment https://www.bigmacktrucks.com/topic/51543-code-problem/#findComment-383944 Share on other sites More sharing options...
Mackpro Posted October 31, 2017 Share Posted October 31, 2017 Yes, if one of the speed/timing sensors go out , you have to crank the engine about 6-8 seconds before it starts. Quote Link to comment https://www.bigmacktrucks.com/topic/51543-code-problem/#findComment-383948 Share on other sites More sharing options...
Little big mack Posted October 31, 2017 Author Share Posted October 31, 2017 Thank you mack pro for the information. Quote Link to comment https://www.bigmacktrucks.com/topic/51543-code-problem/#findComment-383956 Share on other sites More sharing options...
Little big mack Posted October 31, 2017 Author Share Posted October 31, 2017 Problem fixed. Ended up being metal clip refusing to hold sensor plug. Thank you again mack pro greatly appreciated Quote Link to comment https://www.bigmacktrucks.com/topic/51543-code-problem/#findComment-383969 Share on other sites More sharing options...
chana1634 Posted May 28, 2020 Share Posted May 28, 2020 i have a problem like this my question i used a flywhell that was in 1996 and my truck is 1999, i check and all look the same, could be that is different on the flywheel, i did notice that sensor was unhook before i remove housing, olso did remove sensor, and check magnet on tip and was good, what could i did wrong, Quote Link to comment https://www.bigmacktrucks.com/topic/51543-code-problem/#findComment-452178 Share on other sites More sharing options...
steeler Posted May 31, 2020 Share Posted May 31, 2020 On 5/28/2020 at 10:37 AM, chana1634 said: i have a problem like this my question i used a flywhell that was in 1996 and my truck is 1999, i check and all look the same, could be that is different on the flywheel, i did notice that sensor was unhook before i remove housing, olso did remove sensor, and check magnet on tip and was good, what could i did wrong, Recheck that flywheel. I don't think a 96 flywheel will work on a 99 etech engine. Seen it several times. Quote Link to comment https://www.bigmacktrucks.com/topic/51543-code-problem/#findComment-452351 Share on other sites More sharing options...
chana1634 Posted May 31, 2020 Share Posted May 31, 2020 You are right different flywheel, the 99 etech has two theeth cut half way for timing sensor 96 don't have that mark. thank for your advice 1 Quote Link to comment https://www.bigmacktrucks.com/topic/51543-code-problem/#findComment-452377 Share on other sites More sharing options...
MillennialTrucker93 Posted August 30, 2021 Share Posted August 30, 2021 On 10/31/2017 at 10:18 AM, Mackpro said: Yes, if one of the speed/timing sensors go out , you have to crank the engine about 6-8 seconds before it starts. Would this cause an engine endspeed code or something like that on an ai400? If a sensor is bad would it or going bad would it cause a limp mode. My code was inactive when we scanned the computer after clearing the computer a few days prior. Quote Link to comment https://www.bigmacktrucks.com/topic/51543-code-problem/#findComment-479128 Share on other sites More sharing options...
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