old97 Posted March 17, 2005 Share Posted March 17, 2005 Just threw a new set of NGK Laser Platinum plugs and a fuel filter in this past weekend. Instead of getting slightly better gas mileage, it dropped from 25 mpg or so to around 18 mpg with increased sluggishness. Anybody ever get a bad set of plugs from NGK?? Quote Link to comment Share on other sites More sharing options...
Al_SemC Posted March 17, 2005 Share Posted March 17, 2005 You know what? Mine did that too. Well, except for the slugishness. It got mo powah when I did it. I haven't reset my ECU, though. I'm gunna try that and see how it goes. Quote Link to comment Share on other sites More sharing options...
old97 Posted March 17, 2005 Author Share Posted March 17, 2005 You just unhook the battery to reset the ECU? Quote Link to comment Share on other sites More sharing options...
old97 Posted March 17, 2005 Author Share Posted March 17, 2005 So I didn't search well enough before posting. Found a recommended reset procedure as: 1) disconnect negative for 30 min 2) idle for 15 3) then drive, shut off Will give it a shot. Quote Link to comment Share on other sites More sharing options...
friendly_jacek Posted March 17, 2005 Share Posted March 17, 2005 Unhook and press brake pedal. Are you sure the wires are secure in place? Maybe need for dielectric grease for the connections? Did you check the resistance of plugs and cables? Keep up posted, I am planning to put the laser platinum in soon. Quote Link to comment Share on other sites More sharing options...
old97 Posted March 17, 2005 Author Share Posted March 17, 2005 10-4. Checked and rechecked physical connections. All lubed up with dielectric grease. Just got new wires within the past year, but will be rechecking them with the multimeter this evening after work. Resistances should be in the hundredths of an ohm, correct? Quote Link to comment Share on other sites More sharing options...
Tiny Clark Posted March 17, 2005 Share Posted March 17, 2005 Resistance will probably be 10 to 20 K Ohms. As long as the four wires are relatively close to each other, no problem. Quote Link to comment Share on other sites More sharing options...
Al_SemC Posted March 17, 2005 Share Posted March 17, 2005 I didn't use dielectric grease or check the wires, so mine might be unrelated. I might check tonight if it's not too wet out and I can find my dad's multimeter. Too bad my good one's 90 miles away. I second the 10-20kOhms motion, especially the "They should all be roughly the same" part. Quote Link to comment Share on other sites More sharing options...
old97 Posted March 18, 2005 Author Share Posted March 18, 2005 Got between 9.4 and 10.0 KOhms for the wires so they all look good. What is an acceptable range on the plugs?? The measurement is made from the wire boot end to the probe I assume. Quote Link to comment Share on other sites More sharing options...
M@dM@x Posted March 18, 2005 Share Posted March 18, 2005 I'm actually having a similar problem with my Probe. After changing the fuel filter I've noticed decreased MPG (not as bad as yours though). I reset the ECU tonight hoping it fixes the issue. Quote Link to comment Share on other sites More sharing options...
friendly_jacek Posted March 18, 2005 Share Posted March 18, 2005 Got between 9.4 and 10.0 KOhms for the wires so they all look good. What is an acceptable range on the plugs?? The measurement is made from the wire boot end to the probe I assume. NGK plugs read 5-6 kohm or so. Quote Link to comment Share on other sites More sharing options...
friendly_jacek Posted March 21, 2005 Share Posted March 21, 2005 Any follow up on this? And BTW, according to FSM (in kohms I presume): #1 cord: 5.6 — 10.6 #2 cord: 7.3 — 13.7 #3 cord: 5.9 — 11.1 #4 cord: 7.3 — 13.7 Quote Link to comment Share on other sites More sharing options...
Tiny Clark Posted March 21, 2005 Share Posted March 21, 2005 The resistance of the plugs themselves will be completely open. Quote Link to comment Share on other sites More sharing options...
old97 Posted March 23, 2005 Author Share Posted March 23, 2005 Been away from the computer for awhile so haven't been able to give an update. Anyways, turns out the problem was in my tires. Had just bought new tires two weeks ago and for some reason three were at 28 and the fourth was at 22. Thought I might have picked up a nail, etc in the lower one over the weekend but couldn't find anything. It was really starting to annoy me since everything checked out ok and it was running fine except for the mileage drop. After airing them back up, I'm back at about 24-25 mpg. Quote Link to comment Share on other sites More sharing options...
friendly_jacek Posted March 23, 2005 Share Posted March 23, 2005 Been away from the computer for awhile so haven't been able to give an update. Anyways, turns out the problem was in my tires. Had just bought new tires two weeks ago and for some reason three were at 28 and the fourth was at 22. Thought I might have picked up a nail, etc in the lower one over the weekend but couldn't find anything. It was really starting to annoy me since everything checked out ok and it was running fine except for the mileage drop. After airing them back up, I'm back at about 24-25 mpg. Thanks! Quote Link to comment Share on other sites More sharing options...
Chef Posted March 23, 2005 Share Posted March 23, 2005 Holy crap!!! Your mileage dropped from 24 mpg to 18 just from low tires?! I would expect a little maybe, but yeesh. Maybe I'll try inflating mine a bit more than normal recently and see if that picks up the mileage a bit. Quote Link to comment Share on other sites More sharing options...
old97 Posted March 23, 2005 Author Share Posted March 23, 2005 Yeah, got em back up to 32, and they roll nicely. Quote Link to comment Share on other sites More sharing options...
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