Question about 1999 Mercedes-Benz E-Class

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When transmission is warm up there is no power ONLY in reverse gear unless building up pressure by pushing gas.

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  • archwy Oct 02, 2010

    sorry but my car is 1992 400 E not 1999 and no cod comming up

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This sounds like a maintenance issue which could cause further high dollar issues. Have the transmission looked over by a trusted transmission technician. You will probably want to have the filter and fluid changed and the cooler flushed out. Once this is done and has been taken on a lengthy test drive(15 - 20 miles), I suspect you will find a vast improvement in the shifting quality and timing. On these cars, it should be a fluid movement between shifts and appear seemless to the driver. Perform these tasks first and let me know if you need further advice.

Posted on Oct 03, 2010

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Is there a CEL on or any service codes coming up?

Thanks!!

Posted on Oct 02, 2010

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Wh is the reverse gear not building pressure


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I have a 1996 chevy silverado 4wd with an automatic transmission that has 180,00 miles and had the transmission rebuilt at 145,000 miles. From first to second gear it wont shift unless you left offf the...


Put a line pressure gauge (or visit a local trans shop) on the pressure test port and go for a drive to verify proper line pressure. Base pressure at idle in P,N,OD should be around 70psi and around 140psi in R. Max line pressure should be at least 190psi at WOT in 1st or 2nd, 225psi is optimum. If base pressure is low, trans or pump is worn out. If max pressure is low, check EPC solenoid. If reverse is slow to engage, and line pressure does not come up to at least 130psi in reverse, replace the boost valve with a Transgo 0.500" boost valve (easy fix in pan)
1-2 shift does not happen at WOT until you let off the gas: Best case: try replacing the TPS. Middle case: leak in the 2nd gear apply circuit (servo assembly or 1-2 accumulator). Doublecheck by using the pressure gauge and watch for a big drop when the PCM commands 2nd gear. Worst case: poor line pressure rise
1-2 Shift shudder at WOT; delayed or abnormal 1-2 shift; There's a problem ONLY on the 1-2 shift: 1-2 accumulator piston cracked or stuck cocked in the bore. Check the yellow spring inside the accum housing for breakage. Also, if the accumulator housing walls are scored, the housing must be replaced. Easy fix in the pan.
1-2 shift is delayed and harsh, may not shift into OD: Check TPS for smooth and linear electrical response over the entire range of motion. If not, replace.
Good luck and suspect the first two problems mentioned above. Thank you for suing fixya

Mar 15, 2010 | 1996 Chevrolet Silverado 2500

2 Answers

Car goes into reverce but does not engage completely works fine in forward, when in reverce it seems lik it wants to ingage but does not. it makes a chattering sound and feeling. what electric part puts...


Hello. As you know, the transmission is one of the more sophisticated components in any auto. It takes the most transmission pressure to engage reverse, third, and fourth gear in an auto tranny. In an auto tranny, the shifter is connected to a linkage that manually shifts between the different gears in the transmission. When you shift into reverse, all transmission pressure is concentrated to engage reverse. When you shift to drive the transmission will operate normally, building pressure until it can shift into the next gear. With third, second, or first gear selected it will lock out all higher gears (Unless the TCU detects overrevving of the engine, in which case it will override gear selection and upshift to avoid engine damage). All the TCU does in a modern auto tranny is control shift points. Years and years ago, shifting was controlled by a spring attached to the gas pedal. When the gas pedal was depressed, the spring would expand. As tranny pressure grew, the spring would become compressed until it was fully compressed, engaging the next gear. The harder you stepped on the gas, the longer you went until the tranny shifted. In modern transmissions the TCU dictates shift points, and not much else. The TCU will also control when the torque converter will lock, but that's where it's duties end. The problem with engaging reverse is either a linkage issue, or a problem with the pump not building enough pressure to fully engage reverse.

Try putting the shifter in reverse, holding the brakes firmly, and giving the car gas. If the car reaches a higher RPM and suddenly slams into reverse it is the pump. The pump will only build enough pressure to engage reverse with higher RPM's. If the pump is severly damaged it won't engage at all, but if this is the case it probably won't engage third or fourth gear either at that point. If the problem is with the linkage, reverse just won't engage whatsoever, despite RPM's. I'd say start with the shift linkage. If it's bent or misadjusted it could cause reverse to not be fully engaged. The TCU doesn't control reverse at all, since there are no shift points and no need for the torque converter to lock.

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1 Answer

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