wet weather poor performance
#1
wet weather poor performance
Hey folks, I have a 94 model 4x4 with a 4.3 vortec that runs AWESOMELY. One exception - when it is above freezing & it is wet outside, it runs like crap and I smell un-burned gas. I suspect I have some ignition wire that is missing insulation that shorts out when it is wet outside causing some of the cylinders to not get spark. I know when this happens, it runs like crap & sucks gas like nothing else. It is so cold outside, I dont want to get out there to fix it, so if anyone knows a good place to start looking so I can get it done fast, then please inform me. Just for the record, I did a serious tune up with upgrades less than a year ago. I put in NGK iridum plus, good wires, high flow air filter, removed the cat & put in a flowmaster 40 series mufler. There is no trouble light showing and again, when it is dry out, it runs great.
#2
RE: wet weather poor performance
Wet weather problems are a clear sign that you have an ignition problem. Areas of concern are the wires, cap, and rotor.
#3
RE: wet weather poor performance
To Kyle's note about cap, wires and plugs, I'd add that you only want to put Delco plugs in - the NGKs are great in Nissans and Toyotas, but you need Delco plugs in your Blazer.
#4
RE: wet weather poor performance
On the later trucks, NGK plugs were used at some point in the factory. I have removed them from a few different s-series trucks and they looked good. There is much speculation about AC Delco and NGK in terms of who makes what for which company and then rebrands them. I am fairly confident that some AC Delco O2 sensors are in fact made by NGK, but branded for AC Delco. I would agree though that in terms of plugs, AC Delco plugs seem to be more consistent and longer life than most all others.
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