Egr default

Asked by GuruSKRCZ Jun 08, 2019 at 02:16 AM about the 1993 GMC Suburban C1500

Question type: Maintenance & Repair

When I barely give it throttle about 1200 rpm it
starts stumbling the egr valve opens all the way
then closes it repeats itself until I give more gas or
let off , it idles great .done changed egr valve an
solenoid both temperature sensors, complete tune
up,  rebuild the tbi regulator, new harmonic
balancer timing chain , knock sensor, new ecm
computer idk what to do I'm buying all this stuff
and havent fixed the problem

1 Answer


Checked to see if you have a spider injection system..,I had a 96chevy...had all kinds of issues and spider system under plenum was cause. Was leaking gas, fouling out etc...but there's no real test for issue other than replacing to new design...hope that helps

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