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It is probalbly because the wider gap plugs was running a little hot in that year and engine.Īlso check the camshaft offset setting on the dist with a engine scanner. *** And do parts counters like autozone pull up the new spec if I ask for the bosch? (ie they are pre-gapped at 0.40).ĪC Delco is the only plugs to use in a GM.Īs far as the change in gap or plug no goes on your truck. So which is better, bosch +4? or iridium? now my mileage is dropping some, and I keep the engine maintained very well. Would this explain why at 38K miles, my factory stock plugs looked like they had 200,000 miles? I changed them two years ago, and I doubt they were the "new spec" even though they were oem. He also told me that the only difference with the larger gap is that it is a bit of a hotter spark wich helps with cold weather starts and mileage a bit in colder climates as wel but not all that much. They use the iridium plugs with a ".040 gap.
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That would make your recommended plugs a colder marine type plug designed for a boat engine. That would make the plugs (if AC), Mmarine. The GM mechanic told me that they no longer use the platnium plugs even if someone brings in an older vehicle for a tune-up and it calls for the platnium plugs. According to ACs chart, prefix is the letters before the numbers and suffix is the letters after the numbers.
#Ac delco iridium spark plugs crack
It looked like a crack in the porcelain it was gouged that deep. I should take pictures of one of the worse plugs and post them here. This is where there is too much resistance for the spark to go through the plug, so it will arc from the top post of the plug along the outside porcelain to the hex nut part of the plug thus causing the miss that i was having. The platnium plugs are gapped at ".060 which a GM mechanic told me they no longer use because the resistance gets too high and causes carbon arcing. To make a long story short i changed the plugs but not the wires as they looked alot newer than the plugs did and that is where all the problem started. Thus began approximately one month of headache trying to figure out why it was missing so bad after about a week.
![ac delco iridium spark plugs ac delco iridium spark plugs](https://inetmarine.com/images/products/detail/ACDelco41-993IridiumSparkPlug.jpg)
4 REBATE on four ACDelco Gold Rapidfire Single Platinum Spark Plugs. 8 REBATE on four ACDelco OE or Gold Double Platinum Spark Plugs.
#Ac delco iridium spark plugs professional
When it came time to do a tune-up on my silverado i went with what was in there, the platnium plugs. AC Delco Professional Iridium Spark Plug Iridium allows for smaller, more efficient electrode designs for improved cold starting and quicker acceleration. 12 REBATE on four ACDelco GM OE Iridium Spark Plugs.