Receiving this SES signal after replacing EGR Valve, EGR solenid, both MAP sensors. Only occurs between 0-55 Mph. Outside Temp of 99+. 1994 6.5 turbo diesel in a Blazer. Driving me nuts. Help!!!!
Newbie
Receiving this SES signal after replacing EGR Valve, EGR solenid, both MAP sensors. Only occurs between 0-55 Mph. Outside Temp of 99+. 1994 6.5 turbo diesel in a Blazer. Driving me nuts. Help!!!!
Enthusiast
Are you sure the vacuum pump is working properly?
None of those parts can do anything without vacuum.
1995 Chevy K2500 Ext. cab 6.5L.<br />1993 GMC K1500 Ext. cab 6.5L with Banks Turbo
Newbie
This is what you should try; put a plastic tee on the EGR line at the egr, run some tubing off the Tee and into the cab. Connect it to a vac gauge. Any time your just cruising along on level road, you should see about 20" of vac on the gauge. there is allmost allways some vac in the line except while accelerating or in park. If you don't have this much Vac, It is possible you have a bad vac pump. When you took off the EGR, Were the 2 EGR ports in the manifold clear? Many times the foward port will be cloged shut with slug and the rear one partly cloged, which will result in a "insuficiant exhaust flow" EGR code. If you tee into your vac pump hose, you should see at least 20" of vac there. Good Luck
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