GMC Safari Intermittent Miss

GMC SAFARI
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WMCCREARY
  • MEMBER
  • 1 POST
I had a tune up 6 months ago and the mechanic said the spark pugs wires were bad and wanted a fortune to replaced them so I did it myself and put the best Bosch wires I could buy in it 6months later it stated again so i talked to the mechanic and he said its because I didnt used ac delco oringinals in it. That doesn't seem logical to me ! since I had it apart i replaced the rotor and cap. this is an intermitant problem some times the van will run 2 days ok then it starts agian then goes away. Any help finding this will be much appreciated
Jan 23, 2006 at 5:44 AM
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2CARPRO JACK
  • ✓Experienced Mechanic
  • 11,533 POSTS
you should use the factory parts, but it sounds like you might have a injector thats sticky or failing.If your van has the CPI injection (vin code W, 8th digit in the vin) then the injector would be sensible
Jan 24, 2006 at 8:37 AM
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MVANNESSJR
  • ✓Experienced Mechanic
  • 223 POSTS
Using OEM parts is probably best for GM vehicles. BOSCH and other aftermarket equipment on factory GM vehicles can cause premature wear and tear on the plugs, etc. From personal experience using BOSCH plugs and wires on my vehicle (before some modifications) the plugs would burn too hot and basically fry in no time.

I would say if the plugs look destroyed or oil fouled you may need to replace them. The wires should be fine for the time being.

It may be the injectors, it is logical, but before investing a lot of money in that, I would start looking a the smaller items.
Jan 24, 2006 at 5:28 PM
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Suggested Repair

Prefer OEM AC Delco ignition parts on this GM van. Inspect the spark plugs for heat damage or oil fouling and replace them if needed; the wires should be acceptable for now. Before spending on injectors, check smaller ignition items, and if the van has CPI injection (VIN 8th digit W), test for a sticky or failing injector.

Conversation Summary

The owner of a Safari van reports an intermittent miss that returned months after replacing the spark plug wires with Bosch parts and also replacing the distributor cap and rotor. A mechanic blamed the non-OEM wires. Experts say factory AC Delco parts are preferable on GM vehicles and that aftermarket plugs or wires can wear prematurely, but they also suggest inspecting the plugs and checking smaller items before investing in injectors. One expert specifically suspects a sticky or failing injector if the van has CPI injection, identified by VIN code W in the 8th position.

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