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Amedee, GMC Technician
Category: GMC
Satisfied Customers: 25214
Experience:  ASE Technician advanced level specialist
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GMC Safari: 1996 Safari all of a sudden was stumbling badly

Customer Question

1996 Safari all of a sudden was stumbling badly and couldn't go beyond 30mph. I went ahead and replaced a bunch of parts...
- intake manifold gasket
- fuel spider
- plenum gasket
- valve cover gaskets
- throttle body gasket
- thermostat
- cleaned IAC
Fixed original problem, but new problem...
- Loud hiss at shut down, near passenger side, alternator.
- Slight stumble and hissing at a complete stop.
- Completely stalls when shifting to neutral or park. Here's a video...
I tried looking for vacuum leaks with carb cleaner from the doghouse but no luck. Can't really access the manifold from the front without pulling things apart, which I want to avoid!
Any ideas??? Thank you!!!
Submitted: 10 months ago.
Category: GMC
Expert:  Amedee replied 10 months ago.
Hello and welcome! My name isCustomerand I can assist you with your question. Are you looking for some possible causes or would you like me to walk you through this diagnoses?
Customer: replied 10 months ago.
Diagnosis please
Expert:  Amedee replied 10 months ago.
Ok, no problem. The intake needs to be smoked checked using a smoke machine to locate any air/vacuum leaks.
Customer: replied 10 months ago.
Before going to a smoke machine or doing a bunch of troubleshooting do you have a photo of what an Evap valve set up looks like for my engine? I'm wondering if it's set up wrong. Could that cause the symptoms I'm experiencing?
Expert:  Amedee replied 10 months ago.
You mean an evap system diagram?
Customer: replied 10 months ago.
Not the whole system. I think just the Evap purge solenoid and all the hoses and wires that connect to it.
Expert:  Amedee replied 10 months ago.
I can certainly check.. can I get your VIN?
Customer: replied 10 months ago.
Expert:  Amedee replied 10 months ago.
Thank you.. one minute while I check for you..
Expert:  Amedee replied 10 months ago.
This is what I have according to the VIN you provided..
Expert:  Amedee replied 10 months ago.
I am glad I can help! It has been a pleasure working with you. Please dont forget to honor your good faith deposit by rating my answer as "Excellent Service" for assisting you today. Please let me know if you have any further questions.