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| M104 manual trans.; Not giving full revs | |
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| Tweet Topic Started: Sat May 13, 2017 9:03 pm (590 Views) | |
| Mohammad | Sat May 13, 2017 9:03 pm Post #1 |
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weneakhborz
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As I fail with the search feature I seek your help So, a friend of mine swapped a 2.5-15 lump "he scrapped the engine " and swapped it for a 3.2 M104 3.2 and kept the manual Gearbox.But today he told me the engine isn't revving past beyond about 4k rpms. The thing is I noticed he kept the 4 cylinder rev counter." I know it is reading incorrectly" . So, what might needs to be done to let the engine rev to its full potential? Is the rev counter responsible for this? Edited by Mohammad, Sun Aug 27, 2017 1:17 pm.
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| MercManCraig | Sat May 13, 2017 9:41 pm Post #2 |
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Craig
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He needs to replace the fuel pump relay for a 6 cylinder one. Four cylinder models have two tabs on the flywheels for the 2 ignition events. The sixes have three tabs on the flywheel for the three ignition events so running a 6 cylinder engine with a 4 cylinder fuel pump relay results in an artificially high rpm output, the issue hes having is he's hitting the rev limiter
Edited by MercManCraig, Sat May 13, 2017 9:43 pm.
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| Mohammad | Sun May 14, 2017 6:11 am Post #3 |
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weneakhborz
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Fantastic. thanks a lot . is there any thing needed to Be Done for the Flywheel? I Believe he is Still Using the One that came on the Car. "m102" . |
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| Mohammad | Mon May 15, 2017 6:32 am Post #4 |
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weneakhborz
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went to Check what you Suggested. and Found that they have the Car Running with the Fuel Pump Connected SOme how Directly TO the Switch and Currently Is Running with no Fuel Pump Relay! |
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| MercManCraig | Mon May 15, 2017 7:52 am Post #5 |
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Craig
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Sounds like its not a CIS engine if its a custom install could be any number of faults. |
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| Mohammad | Mon May 15, 2017 8:00 am Post #6 |
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weneakhborz
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he is Running CIS but SOme Flickering about has Happened !! |
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| jeremy | Mon May 15, 2017 9:55 am Post #7 |
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Too Far Gone To Help
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These M104 units will not rev past 4000 revs whilst in Park or Neutral. Hope this helps. Jeremy |
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| Mohammad | Mon May 15, 2017 10:58 am Post #8 |
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weneakhborz
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yes, that is what is Happening I guess.we are Looking for a Way to Fool the ECU to think it is in D position since the car is manual. Edited by Mohammad, Mon May 15, 2017 11:02 am.
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| Mohammad | Mon May 15, 2017 1:48 pm Post #9 |
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weneakhborz
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does he Need to Use a 6 Cylinder Speedo and RPM Gauge ?
Edited by Mohammad, Mon May 15, 2017 1:56 pm.
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| smiffy | Tue May 16, 2017 6:56 pm Post #10 |
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just strumming me paws...........hum-de-hum!
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jeremy mine used to freely rev right round to 5/ 6 k ...... auto if that makes a difference. mohammad how are you buddy,hope your well, what? or are you getting any fault codes? overload protection switch? what coil packs is he running? has he replaced the crank position sensor? does it die/stumble on idle? feeling the gearbox is at fault auto to man, same loom ? regards smiffy. |
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| Mohammad | Wed May 17, 2017 6:23 am Post #11 |
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weneakhborz
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I am doing very well ,man. thanks a lot. I hope you are doing well too.I think the Fault Codes are not an option since the whole car was Done "is still under the knife " of some one who thought it was Only a Mechanical Job.he is good at that , but not so Good on the Electronics Side. I will Let him Check the OVP. I have no Idea what Coil Packs he is Running.I can Ask him to send me a Pic if that helps.will Check on the Crank P. Sensor as Well. the Car Runs very Smoothly and Very rev happy until it hits the Rev Limiter "not more than 4k RPMS". and starts right away hot or cold. I believe the Gearbox IS at Fault.they are Currently using the Loom of the donor car."was Auto Gearbox" . Edited by Mohammad, Wed May 17, 2017 6:25 am.
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| Mohammad | Wed May 17, 2017 9:37 am Post #12 |
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weneakhborz
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So, the OVP was Changed.Several Times Thinking it was the Reason. Coils were Checked and Changed Several Times With no Luck. I am Waiting for him to Send me the ECU part Number. if that might Help. |
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| smiffy | Wed May 17, 2017 10:31 am Post #13 |
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just strumming me paws...........hum-de-hum!
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hi bud, what about the crank position sensor? was the donor g-box off ? |
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| Mohammad | Wed May 17, 2017 11:56 am Post #14 |
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weneakhborz
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I am Not Sure actually about the Crank P. Sensor. the GB was off the Engine "the car" when pulled out. |
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| Mohammad | Wed May 17, 2017 12:01 pm Post #15 |
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weneakhborz
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checked with the Guy about the C.p. Sensor and he Told me it is New. the car Runs very good and Reliably with No Problems Except for the Short Revs |
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| Mohammad | Wed May 17, 2017 2:36 pm Post #16 |
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weneakhborz
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so, this is the ECU he is Using At the Moment. I Hope this Helps.
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| MercManCraig | Wed May 17, 2017 4:45 pm Post #17 |
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Craig
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Jeremy is your best bet he's already been there with his 3.6 |
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| smiffy | Wed May 17, 2017 9:38 pm Post #18 |
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just strumming me paws...........hum-de-hum!
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il check on some of my old pictures on the ecu i reakon its the gearbox switch at fault. i also dug this out from another forum member on another site if helps? " Do you have any codes in your throttle control system? That's E-gas if you have ASR, or Cruise control / idle speed control if you don't have ASR. If you have ASR, these faults will often cause a car to go into limp throttle as well, but not always. That being the case, failing tranny range switches are almost always diagnosed and remedied on ASR cars because they go into full limp throttle (you never get to your 4K rpm range), but they are almost always missed on non ASR cars because there they tend to only cause symptoms similar to yours. Also note that in rare situations, these switches can be defective and not throw a code. Since it's a switchable resistance, the control units can simply be fed a resistance signal corresponding to a gear other than that actually selected. I'm sure there are already extensive threads available addressing these switches on other forum topics. They may be listed along with ASR limp throttle topics since all 500s had ASR, and that's the primary fault these switches cause on ASR cars." im really curious mohammad to know the cause and resolve of this problem as i want to purchase another m104 3.2 block. il keep looking for poss answers. but also as stated being a complete custom build this may be a simple fix or or not? kind regards, smiffy
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| Mohammad | Thu May 18, 2017 6:53 am Post #19 |
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weneakhborz
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yeah , Right I remembered. I Knew Some one did this Kind Of Conversion but Couldn't Remember who he was. |
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| Mohammad | Thu May 18, 2017 7:41 am Post #20 |
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weneakhborz
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Good Morning Smiffy. I Do Believe it is the Gearbox Switch too. but I have no Idea what Needs to Be Done. I Appreciate your Cooperation . I will Be Looking forward for any Input. |
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| smiffy | Thu May 18, 2017 2:12 pm Post #21 |
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just strumming me paws...........hum-de-hum!
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keep us posted mate, i will dig out the pics when home cheers |
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| Toff190 | Thu May 18, 2017 2:28 pm Post #22 |
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190 Mob Member and a Wise Guy.
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So the the engine rev's freely in drive but not in neutra/park l? If this is the case then that's exactly what this engine should be doing as it has a rev limiter which kicks in at 4000rpm. Edited by Toff190, Thu May 18, 2017 2:29 pm.
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| Mohammad | Thu May 18, 2017 3:02 pm Post #23 |
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weneakhborz
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the car is Now a Manual Gearbox,mate . and even while Driving the car Doesn't Rev past 4k. other than that , the Engine Runs, Starts and Drives Perfectly. |
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| jeremy | Sat May 20, 2017 10:49 am Post #24 |
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Too Far Gone To Help
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Ah, then something isn't right. I couldn't even begin to point you in the right direction. You need someone with skillz. Jeremy |
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| Mohammad | Sat May 20, 2017 11:19 am Post #25 |
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weneakhborz
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ahaa, Skills ... around this Part of Saudia , you have Better Chances Finding Crude Oil !! that is why I am asking this Question Here. from what I can See , the Symptoms are Exactly like what the Engine would DO if you Rev the Engine in Neutral with an Auto G.B. that is were I Got My Guess from. I might be Wrong too. From What I Read , these are the Main Suspects 1- the Crank Sensor is Reading a Single Signal from a Single Tooth"magnet" on the 4 Cylinder Fly wheel. 2- the RPM Gauge is Still the One from the m102. 3- the Auto Gearbox Selector that should be Sending Some Signal to the ECU. |
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| carat 3.6 amg | Sun Jun 4, 2017 10:11 pm Post #26 |
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Newbie
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Your ecu is not seeing the speed signal from the abs system, it thinks the car is not moving so wont allow you to rev past 4k. This can be solved by either wiring in the signal wires (the 2 shrouded pins on the ecu), or just use an earlier ecu without this function. The fuel pump relay is just a normal 4 pin relay for this engine, this and the rev counter will not affect the running of the engine. |
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| Mohammad | Mon Jun 5, 2017 9:41 am Post #27 |
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weneakhborz
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this is what I think is happening. I went to the Check the car with the Owner yesterday and went to See a guy who Said he can fix it and Turned out he is Not Very Familiar with the whole "car Electronics" Business !!! any ways,from what I read, Pin No. 8 on Socket A is the Speed Signal . can You Show me which Ones Do I have to Wire together? Or can you give me the Older ECU Number? Many thanks in advance this is a huge Help. Edited by Mohammad, Wed Jun 7, 2017 8:28 am.
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| Mohammad | Sun Aug 27, 2017 1:02 pm Post #28 |
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weneakhborz
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Gents, as the Problem is Still Present with the rev Cutting at 4k, we narrowed the Problems to the point that we need to Link the Speed Sensor from the Rear Diff to the ECU. the Question is , is it Correct that we need to Connect the speed Sensor to Socket A Pin Number 8 ? and How to Connect it? is it Simply a Wire jumping from the Sensor cable to the Ecu-? is it safe like this or what is the Correct way to do it? |
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| Mohammad | Sun Sep 24, 2017 12:54 pm Post #29 |
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weneakhborz
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Bump. |
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![]](http://z2.ifrm.com/static/1/pip_r.png)
" and swapped it for a 3.2 M104 3.2 and kept the manual Gearbox.




thanks a lot. I hope you are doing well too.
around this Part of Saudia , you have Better Chances Finding Crude Oil !!
3:14 PM Jul 11