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Im just now putting the car together but the situation is car cranks no start, no fuel through injectors, no spark but, fuel pump primes in on position. No CEL in on position. New crank position sensor and knock sensors.
Im assuming the harness and dme are good given I had an s52 in running previously.
Only changes between the s52 and m52 is a new chip Rk tunes base tune, fuel system and the r8 coil conversion kit from turbothirty6. dw pump, ptfe lines to nuke fuel rail with south bay injectors.
At first i was thinking maybe the injectors were stuck because they were sitting for half a year just didnt get to install them (bought new) but it cant be all of them at the same time or the time when i did the s52 swap i had the fuel feed and return lines swapped but that couldnt be it because I made sure i routed the lines right and there is fuel pressure in the new rail before cranking.
Any Ideas? thinking bad batch for crank position sensor or relays? or camshaft sensor?
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Do you see the tach move while cranking maybe the ecu isn't awake? You can do an input test at main realy from ecu to be sure. Also I have the same r8 coil kit did you splice into the factory correctly and didn't short out the ignition module supplied with turbothrity6 kit?
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ill have to check if the tach moves. But im pretty sure i spliced them in correctly he basically was telling me what wires to splice to.
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so i swapped out the cps as well as dmes but no luck and no the tach does not move when i crank it
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Also brand new CPS measured at 563 ohms its not extremley off but Iirc Bentley manuals says 540 -/+ 10
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Might have an issue with the dme then. Did you verify that the EWS was deleted from the dme?
Last edited by E30s50dude; 11-30-2021 at 12:33 AM.
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EWS 1 will cause crank no start ? when i was doing some research i believe it was only the EWS II which started after 1995 dont quote me on that tho
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correction i have a 413 red label dme so i dont have ews at all
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Ur right sorry I saw s52 and thought it was still OBD2. Besides double checking ur grounds making sure those are tight. Can u hear the IACV hum with key in Accessory mode? Did u verify you have spark and compression on this motor when u crank the car over?
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IIRC on obd1 engine harness it is possible to mix up cam and crank sensor connections. maybe double check that as well.
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All red labels have the EWS 1 in them. If you change the chip, it won't start if the DME is used on E36/E34, that is why wire 66 must be cut. But that is just a speculation of what kind of problem you may experience. You have to have a obd1 scanner to know for sure.Originally Posted by Ravenv
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yes definitely caught that but it was with the iac and crank but still no luck
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okay this i havent seen anywhere will definitely try this tomorrow
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rk tunes obd1 base tune if that help. not to sure if they put in an ews 1 delete on it
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x20 pin 7 is unplugged but still same issure crank no start
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i had an issue with reputable tuner's obd1 chip before. he sent me 3 chips, none of them would start the car. old chip started the car no problem.
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yah i just got an email from rk tunes it happens but very very rare that the chip i got didnt reflash properly so gonna check all the wiring first then last thing is to mail the chip back for a new one
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was wondering what does the fuel pump priming and it turning on while cranking indicate with no spark and injectors not pulsing? if fuel pump is on while cranking its getting a reading the crank position sensor, correct?
correct me if im wrong but ive also heard that no cel in on position could indicate a bad dme but the dme i used was on a working setup before with a different chip from trm
so i was thinking about the email rktunes sent me and hoping that its just a bad chip
Member
IIRC e36 fuel pump should prime with just key on. you don't have an extra chip laying around just to see if it tries to start?
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i have the trm s52 obd1 chip but i accidentally stepped on it and when i tried it it fuel pump didnt prime…..
Member
Did you check fuel pump relay and see if pump is getting switch 12v signal from the main relay with key on? IIRC fuel pump relay trigger wire is purple and green don't quote me on that though.
Member
alright so weird thing is happening with the rk tunes obd1 chip in on position the fuel pump primes no CEL (same crank no start) and when i swapped it with an trm obd1 swap chip in the same dme the fuel does not prime w CEL (crank no start as well) so im confused on what it could be
Last edited by Ravenv; 12-11-2021 at 10:19 PM.
Member
Sounds like a circuit board issue with the DME maybe? Have you tried swapping in another DME and trying both chips? I’d doubt u have bad hardware from 2 diff tuners but that’s where I would start.
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So I did try switching the chips but only with the TRM chip but not the rk tunes chip(with no module). So i found out that I forgot the piggy back module the rk tunes provides, it get sandwiched between the chip and ecu so I was like wow rookie mistake so I put the module in thinking that was the culprit and in the on position i now have a CEL but now it doesn’t prime the fuel pump with out the module I was getting the pump to prime but no CEL in on position. Now I’m gonna try what u told me about switching both dmes and chips.
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FOUND THE CULPRIT! So this whole time it was the engine harness, I didnt think it was it because the same harness and dme was running on my previous s52 no problems. Dont know exactly what but luckily i had an extra harness laying around. Thanks for all your ideas it still help me trouble shoot things and when it got down to the things that were still working and checking out good the final one was the engine harness.
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