Tucano396
Newbie
Hoping this helps somebody else who's pulling their hair out (potentially after replacing the solenoid and vac lines). I only found one other GMT400 thread which addressed the issue (gmt400.com/threads/which-egr-valve.60874/post-1290515) and it didn't have pictures, so see attached.
Code 32 on my 1994 Suburban 5.7L. Old EGR valve's diaphram was shot.
Ordered a Delphi "EG10099". The truck stumbled ("hesitated" or "almost died" as some people may describe it) from a stop if I gave it anything less than full throttle. Seemed like about half the Amazon reviews of comparable EGR valves had identical issue.
One Amazon reviewer (tried multiple times to find his review, sorry dude but you sir are a champion) described some examples of these valve having a normal-sized opening in the vacuum hose nipple whereas on others the nipple is blocked off except for a tiiiiiiiiiiny pinhole. He guessed that this was needed on some engine versions/revisions where a normal sized opening permits too much vacuum too suddenly under partial throttle.
Sure enough, my old valve had a pinhole opening whereas the Delphi I installed had a normal size. Local Carquest had a pinhole version instock; installed it and no more problems.
Extra note: after some light research it seems all the manufacturers of these valves sell a pinhole version and normal-opening version under the same p/n for reasons far beyond my feeble mind. If you can only find the normal version, all hope is not lost; break the pinhole nipple off your old valve and shove it into the hose before installing. (Here as well, props to the Amazon reviews dude)
Code 32 on my 1994 Suburban 5.7L. Old EGR valve's diaphram was shot.
Ordered a Delphi "EG10099". The truck stumbled ("hesitated" or "almost died" as some people may describe it) from a stop if I gave it anything less than full throttle. Seemed like about half the Amazon reviews of comparable EGR valves had identical issue.
One Amazon reviewer (tried multiple times to find his review, sorry dude but you sir are a champion) described some examples of these valve having a normal-sized opening in the vacuum hose nipple whereas on others the nipple is blocked off except for a tiiiiiiiiiiny pinhole. He guessed that this was needed on some engine versions/revisions where a normal sized opening permits too much vacuum too suddenly under partial throttle.
Sure enough, my old valve had a pinhole opening whereas the Delphi I installed had a normal size. Local Carquest had a pinhole version instock; installed it and no more problems.
Extra note: after some light research it seems all the manufacturers of these valves sell a pinhole version and normal-opening version under the same p/n for reasons far beyond my feeble mind. If you can only find the normal version, all hope is not lost; break the pinhole nipple off your old valve and shove it into the hose before installing. (Here as well, props to the Amazon reviews dude)
Attachments
Last edited:
