Question about 1992 Chevrolet C1500
Once the truck was fired up and transmission fluid topped up, I went to shift into gear and there's no motion , nothing. Retraced all electrical, and I can't seem to get why. The truck was towed 25 miles with a tow truck, but tranny worked fine before engine blew.
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Posted on Jan 02, 2017
Check TPS for smooth and linear electrical response over the entire range of motion. If not, replace.
Double check by using the pressure gauge and watch for a big drop when the PCM commands 2nd gear. Worst case: poor line pressure rise. Poor line pressure rise due to leaking boost valve, clogged EPC filter screen, failing EPC solenoid, or worst case: leaky seals throughout. Transgo HD2-C kit fixes first two without removing trans. Seal restorer may fix last problem, but probably R&R. Also try a transmission flush with BG brand products (Firestone stocks it).
Put a line pressure gauge ($55 shipped on Ebay, 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).
Good luck and hope this helps get more life out of your transmission, but start with the simple and check the TPS and replace if worn.
Posted on Dec 24, 2009
There is a service bulletin for this condition.It has to do with a ceramic high pressure valve ball fracture inside the fuel injection pump,which may lead to internal pump damage resulting in low fuel rail pressure.This could contaminate the fuel rails and injectors with debris.The fuel pump will operate but with reduced output flow.The fuel injection pump will have to be replaced or repaired.Look and see if there are any repair shops that specialize in injection pumps.Hope this helps.Good luck.
Posted on Apr 06, 2010
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