Having problems with your 2004 Chevrolet Impala ?

I have top of the 2004 impala indy ss.transmission fluid and filter change 6mnths ago at 62000 miles now have 67k.tranny is slipping sometimes any easy fixes

Posted / edited by AnonymousUser on : 19-11-2018

Answers :

Soft shifting, gradual performance degradation: Poor line pressure rise due to leaking boost valve, clogged EPC filter screen, failing EPC solenoid, or worst case: leaky seals throughout. Seal restorer may fix last problem. Also try a transmission flush with BG brand products (Firestone stocks it).\012\012
\012Chances are the boost valve may be leaking or a bad EPC valve. (EPC Electronic Pressure Control valve). Try not to drive the transmission to hard as to ensure you do not do any further damage which would cause in the transmission rebuilt. \012
\012Replacing the boost valve or EPC valve is easy once the transmission pan is dropped. Put a line pressure gauge (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.\012
\012Thank you for using fixya and good luck.
Repair Help & Product Troubleshooting for 2004 Chevrolet Impala

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