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Originally Posted by STOVE BOLT
I Have.
93 Chevy S-10, 2.5, 2wd, 5 Speed.the Problem Is As Follows:
. When First Starting The Engine, It Starts Quickly. Runs Very Nice For A Period Of About 5 Minutes. After It Is Warmed Up, I Can Open The Throtle Approximatly, 25%, And It Stumbles Very Badly. If I Increase The Throtle, It Picks Up Rpm, But Runs Terrabile. Skips, Shakes And All But Quits. If I Let The Throtle Close Completly, It Returns To A Fairly Good Idle.so Far I Have Replaced: The Tps, Cts, And The Egr Valve Vacum Selinoid. No Help. Tonight A Friend Of Mine Took A Vacum Test. It Was 18 At Idle. The Manual Calls For 15-18. So That Is Fine. Next He Disconnected The Vacum Line From The Egr Valve, And It Runs Better. My Question Is , We Connected The Vacum Gauge To The Port On The Valve That Goes To The Egr Valve. Started The Engine, And It Shows Vacum . If The Throtle Is Increased, The Vacum Also Increases. According To The Manual, This Is Not Supposed To Happen. I Think,something Is Telling The Computer It`s Ok To Apply Voltage To The Vacum Valve. Is This True? If It Is Not, Which I Am In Belief Of, What Can Tell The Computer To Apply Voltage To The Vacum Selinoid Valve, At The Wrong Time? I Am At The End Of My Rope With This Truck. By The Way, After This Takes Place, I Get A Code 45. It Is Correct Because The Exhaust Gas Is Very Rich. Any Ideas? I Will Be Eternaly Grateful For Any Light You May Be Able To Shed On This "vixen", S-10 Problem.
Thank You Very Kindly,
Stove Bolt
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