do i need new spark plugs? **PICS**
01-30-2010, 04:07 PM
#1
do i need new spark plugs? **PICS** ive been getting a lot worse gas mileage the last few weeks and im wondering if it is because of the spark plugs. i bought the car in september and i dont know how long these plugs have been in there.
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pics
01-30-2010, 06:26 PM
#6
There is absolutely NOTHING at all different between those two plugs (TR55 and TR5). The reason they have different model numbers is because they come from the manufacturer gapped differently. Its just that sometimes you can't find one, so just ask for the other one.
Just make sure you gap them yourself........ .050 is the gap you want. Doesn't matter if you're bone stock or a 454ci 700 RWHP big fella.
Yes, $17.00 for all 8. Advance Auto is where I get mine.
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Last edited by LS6427; 01-30-2010 at 06:31 PM.
01-30-2010, 06:30 PM
#7
I change my plugs every 20,000 miles. Its too cheap not to.
Thats me....
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01-31-2010, 02:21 PM
#9
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There is no plug that can last 100,000 miles and perform opitimally, no way. Doesn't matter what the manufacturer says. I personally think auto manufacturers want people to try to go that long so when they feel/hear reduced performance or maybe a "check eng" light comes on because the engine isn't running optimally....most people will go into the dealership and then they can bend them over a desk and charge them for all kinds of ****.
I change my plugs every 20,000 miles. Its too cheap not to.
Thats me....
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I change my plugs every 20,000 miles. Its too cheap not to.
Thats me....
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Perhaps you don't entirely know what you are talking about.
I have had many other cars with plugs that have gone over 50,000 miles with no loss of performance or mpg.
01-31-2010, 07:15 PM
#10
I recently changed the plugs in my wife's car and they had 100,000 miles on them. Car ran perfectly fine and there was no loss at all in mpg before I changed them.
Perhaps you don't entirely know what you are talking about.
I have had many other cars with plugs that have gone over 50,000 miles with no loss of performance or mpg.
Perhaps you don't entirely know what you are talking about.
I have had many other cars with plugs that have gone over 50,000 miles with no loss of performance or mpg.
And I'm talking about performance cars. Don't know what kind of car you wife your wife has. But we don;'t really want to hear about Mini vans and Camry's on this site. If she has a performance engine...good luck convincing anyone that 100K plugs perform as good (optimally) as 20,000 mile plugs.
I don't know anyone who would agree that spark plugs that are 50,000-100,000 miles old compared to a set that are only 20,000 miles old....would perform exactly the same. In a PERFORMANCE car. But there's always someones story that their engine does miraculous ****.
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Last edited by LS6427; 01-31-2010 at 08:52 PM.
02-10-2010, 11:06 AM
#11
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are ac-delco stock? mine came with densol plugs stock. 108k miles and i replaced the #8 plug last year around 76k. i probly should change them all out. i wonder why mine came with densol plugs? i thought i remember some others here also coming stock with densol. which mind you are not cheap...
02-10-2010, 11:52 AM
#12
Gap is not a one size fits all. If you have ignition boxes you can add a little gap to your plug where when you run nitrous or forced induction you will lower the gap on your plug, not to mention having to change heat ranges when using nitrous. I know plenty of fbody guys that run around .040 range and i know some running in the .050 and .060 range.
02-10-2010, 05:29 PM
#14
Gap is not a one size fits all. If you have ignition boxes you can add a little gap to your plug where when you run nitrous or forced induction you will lower the gap on your plug, not to mention having to change heat ranges when using nitrous. I know plenty of fbody guys that run around .040 range and i know some running in the .050 and .060 range.
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02-11-2010, 05:32 AM
#15
I would agree to use stock gap with stock engine.
I run 0.035 with my FI application, but if you run FI you already know that they require a narrower gap.
AFA plug life, it will vary greatly. If you pull the plug and the electrode looks worn or the gap has increased, it needs to be changed.
I know someone with a stock Focus who pulled his plugs at 50k and the electrodes were gone. Literally. I (jokingly) told him it was b/c his engine spent all its time at 7k rpm, so it had twice the mileage of a normal Focus.
Point is, plug life will vary. It is something you must monitor. BTW, after I changed plugs in my DD fuel mileage increased by about 4 mpg on the highway. No other changes were made, YMMV.
I run 0.035 with my FI application, but if you run FI you already know that they require a narrower gap.
AFA plug life, it will vary greatly. If you pull the plug and the electrode looks worn or the gap has increased, it needs to be changed.
I know someone with a stock Focus who pulled his plugs at 50k and the electrodes were gone. Literally. I (jokingly) told him it was b/c his engine spent all its time at 7k rpm, so it had twice the mileage of a normal Focus.
Point is, plug life will vary. It is something you must monitor. BTW, after I changed plugs in my DD fuel mileage increased by about 4 mpg on the highway. No other changes were made, YMMV.
02-13-2010, 08:09 AM
#16
Yes it is....for a basically stock engine...which is what he has. There is absolutely NO difference in performance going from .040 - .060 for a N/A engine. I've tried every different setting in my stock LS1 engine and in my built 427ci. No difference. S0o right in the middle is the best choice, unless someone has somne detailed testing that says differently. So .050 is just fine for a stock engine like the original poster has.
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