Timeline for 1996 Chevy K1500 Silverado ZZ4 5.7L - Rough Idle, Plug Damage, Overheating, EGR
Current License: CC BY-SA 3.0
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| Sep 17, 2016 at 17:19 | comment | added | dlu | Nice! I'm used to diesels, no vacuum except what the vacuum pump makes... Also, worth confirming that you are getting vacuum on the control hoses – there could be leaks or a blocked filter. Just pull the hose from the supply side of the EGR solenoid and listen for hissing. | |
| Sep 17, 2016 at 17:16 | comment | added | Pᴀᴜʟsᴛᴇʀ2♦ | To test the EGR, if the back side is open to atmosphere, you can push on the diaphragm (gently). If the engine changes running pitch the EGR is not blocked. To test it further, reroute the vacuum line from the EGR to pull directly from the manifold, bypassing the EGR solenoid. If this causes a change in how it's running, you can assume the EGR valve itself is working correctly. You can check the function of the EGR solenoid by applying power directly to it and listening to the "click" ... if this causes the engine to run differently when engaged, the entire system should be good. | |
| Sep 17, 2016 at 16:59 | history | answered | dlu | CC BY-SA 3.0 |