Question about 1987 GMC G1500

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1999 G1500 5.7 Timing issues?

We are working on a 1999 Savana with about 80,000 miles on it.
The engine is popping and blowing airback out the throttle body, as if it was out of time.
We hooked up the computer and came up with a P1345 Code which states that the engine could be out of time or the sensor is out.
We replaced the sensors, checked the distributor gears, and checked the cam gears, even looked at all the timing marks and timing chain seems to be a little slack, but not enough to looked as if it jumped positions.
Anyone have any idea what else it could be, looks like everything we trouble shot with the timing is correct, other than the slack in the timing chain.The engine still pops and blows back the intake/throttle body as if it was out of time still.
Any help is appriciated!

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Dan12, I have a 2000 savana that had exact same issue, at least appears to be same. Sometimes it would start fine, other times it would act like it was out of time. Finally we had to get it towed because it would not start, turn over, but not start. Probably all over about a three month time frame. The solution that is still working after a year was to replace the distributor cap, it was allowing moisture in. I have seen a moisture reference on line before, never have seen the final outcome. I know it sounds simple but my vehicle went from not being reliable to using every day.

Posted on Sep 15, 2008

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This may idicate the cam pos sensor is out of synch with the crank sensor a full service scanner can check the synch percentage error. Did anyone move the distr.? The rotor must point exactly to # 1 contact at tdc 1 firing.

Posted on May 14, 2008

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I have a1999 gmc suburban that cut of while driving at any speed. 5.7

Posted on Aug 03, 2008

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