And previous owner removed parking brakes
no parking brakes on rear of truck
im getting lean po171/po174 code

 

Before doing anything else, fix the parking brakes. That is a serious safety hazard!

 

what about using chocks?? Since it’s so dangerous the previous owner shouldn’t have done it and sold it with no parking brake hardware.

 

Manual transmission? First gear should be sufficient to hold it unless you have bad compression.

For the lean codes check for vacuum leaks.

 

exactly so if I have the codes bc leaking intake and plenum wouldn’t that be a vacuum leak and also why it’s rolling off the oil changing type ramps.
the clutch releases within an inch of the top. A shop told me IF it’s the clutch it would cost around 1200 or 1500 to replace clutch

 

If the clutch doesn't slip if you floor it in 5th at 40 mph it's still good. That price is about right for a complete clutch job. Disc, pressure plate, throwout bearing, slave cylinder, flywheel, rear main seal, and pilot bearing. Flywheel can be saved if it can be bench ground, not done by hand. Being that it's labor intensive - transmission has to be dropped - it only makes sense to do everything while you are in there.

When my plenum gaskets and isolator bolts started leaking it didn't throw a lean code, it threw an IMRC code. This shouldn't have anything to do with holding it on a hill. Use chocks till you get the e-brake fixed.

 

If I let the clutch out the truck starts moving at almost the top position within an inch of clutch pedal being completely let off of.

 

Doesn't matter as long as it doesn't slip as I described.

 

yesterday (5 speed standard) while towing empty 1000 lb trailer the rpm would randomly jump 500 Rpm’s like 2000 to 2500 slightly like it was going into neutral I made sure it was in 4th and would still do it so I guess the clutch is slipping?? It doesn’t appear to have a transmission dip stick. I believe it was set to cruise control.


someone told me if you do remove the transmission you have to unbolt CAB and jack it up 4 inches to remove transmission. Is this true?

 

Yep, you need a clutch job. No dipstick, it has a fill plug and a drain plug.

 

No, you don't need to jack the cab up.

It's not a bad job, just getting everything lined back up without busting the slave cylinder. Also, replace the slave cylinder.

There are tons of resources out there on here and the Internet on doing a clutch job on a M5OD. They've been around a block or two... since the 80's.