Ok so i recently swapped an r154 into my 93 sc300 and for some reason it shuts off as soon as i let the clutch pedal back up, and yes, i do let it go really slowly back up. It has a jdm motor so no EGR, did the neutral bypass, no Power Steeering, no leaks whatsoever from the engine. Could it be a bad IACV? I also did not wire in the reverse lights, but i dont think that'll cause it to do that, could it?

 

Not wiring your reverse switch shouldn't shut off your car. Your 1st gear is normal?

 

Yeah it only starts in first gear and idles a bit wierd, the revs go up and down for about 10-15 seconds and then idles normal. It doesnt start in neutral either only in first. Right now ima check again for any vacuum leaks. Got any idea what it could be?

 

Did you check that rev gear engages and by turning input, the output shaft turns in reverse. In other words did you bench test the new transmission?

If not, Engage reverse, lift the tail and spin the crank by socket, to eliminate binding.

Salim

 

So, put it in reverse, jack up the rear of the vehicle, and spin the crank pulley? Sorry sorta new at this lol

 

Sorry, I was cryptic, but essentially you will mimmic the engine turning, clutch released, gear in Reverse and the shaft should spin the rear tires through the differential. You will have to fight the engine compression and all the loss in gearing. You can set the gear in N or 1st and see how much effort is needed.

The test will confirm if the R gear is woking and reverse shaft is not stuck.

Salim

 

Yeah reverse works,it moves a bit or sometimes, like today, i moved all the way back to where i needed to then put it in gear and drive off. BUT now it dies when put in second! Checked for vacuum leaks, new fuel pump/filter, all oils are topped off, everything is connected where its supposed to be but no go, ima take it to a mechanic so they can have the headache now, should've bought that 335i instead lol

 

Ya do what salimshah posted to see if your trans is in working order, definitely sounds like a transmission issue.

I bought my R154 off craiglist, guy was like it works fine. I did the rebuilt thru driftmotion and found the following was ****ed and had to be replaced. Spent $1500 on top of the trans for rebuilt.

1-2 Hub
$70.00 Shipped
1-2 Slider
$70.00 Shipped
1st Gear
$120.00 Shipped
3-4 Slider
$70.00 Shipped

 

I would think something about the clutch pedal or neutral bypass is to blame. If the troublesome gear isn't consistent, that ought to rule out the transmission itself.

 

Im 100% posotive my transmission works, but i could be wrong. Ima check on that today later on, but shouldnt this problem be more of an engine rather than a transmission problem? not enough fuel, RPM's to low to for reverse, i also read a vacuum leak can cause the engine to shut off in reverse? Just wondering.
T2D2- clutch pedal is fine and ive checked the neutral safety switch also sinced that was the first thing i thought was the problem.

 

Found the problem while I was diddlying my stick shift!!! Lol. So the car is swapped with an r154, and it only turns on in first gear, never knew why till now, the reason is the fuel pump is on but not engaged or actually "working" you also can't hear fuel rushing in the fuel rail. As soon as I "discovered" this I immediately went through the gears with the car turned to the "ON" position where I can hear the fuel pump work.
1st Gear- Good and can hear the pump working, that's why it turns on in first
2nd(this is where the engine would die while driving)- As soon as I shift to second it stops working, try to turn the car on and it doesnt BUT if I move it up slightly(seems like it has quite a bit a play in the gears but not sure since this is my first manual transmission) a bit you can hear the fuel pump engage. So I pressed the clutch and turned the car over thinking it would turn on since the pump is engaged and I was correct!
3rd- No fuel pump engaging whatsoever, not even if I tried to find the "sweet spot" like I did in second. Car wouldn't start if I turned the key.
4th- Same as third gear, no sweet spot, and car wouldn't turn over.
5th- Good, can hear the pump engaged so I turn the car over and it runs!
Reverse- Good!
What could this be? A bad shifter maybe?

 

I want to say your pinching a wire when your in different gears but doesnt sound likely. I'd check how you did the neutral bypass

You could also do the 12volt fuel relay bypass and have power at the pump when you turn the key and see if it fixes it.

 

I just cut and connected the two big black wires from the auto trans harness together and done. Not much to it haha. Yeah already did that but my main problem is 3rd and 4th gear not working. Also got trouble code 14 which I'll fix soon

 

FIXED!!! 🙌 So a ground cable from the battery was not grounded to the chassis and as soon as that all my problems went away! Who would've thought it was that and wonder how I missed grounding it hahaha. Thanks guys