Running Rich?
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From: Miami, Fl. - Hurricane Highway
Running Rich? I know my car is running rich, i just didn't know how to phrase the title. My mods are in my sig, and when i dynoed it i wasn't able to get an A/F read-out. Well my question is that, lately when i step on it first gear spins crazy and so does alot of 2nd gear. But when i hit third i notice that it will go up in RPMs normal then my i will hear a pop like a backfire. But it happens almost everytime i go WOT and i only notice it in when i hit 3rd gear. Is that normal fo rmy car being rich to backfire like this, if thats whats going on. Thanks
-Joel
-Joel
if you haven't gotten a tune then its probably rich...normal WOT at 6krpm is 11.7AFR(i think) if not it is around 12 something.
I run my car around a 12.9 at low rpm and up to a 13.2 up in the rpms..then back down to 12.9~13.0 around 6k
I run my car around a 12.9 at low rpm and up to a 13.2 up in the rpms..then back down to 12.9~13.0 around 6k
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From: Miami, Fl. - Hurricane Highway
So then its normal for my car to make a popping sound like a backfire, because it makes a pop and the car hesitates for a less than half a second. Just making sure because i first did that when i installed my headers and exhaust system. But now its done it a few times so i was just wondering whats going on.
-Joel
-Joel
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From: Miami, Fl. - Hurricane Highway
Yeah the car still has the stock MAF. Whats LTFTs? The thing is i don't know if its the cold weather lately thats been making it run richer and thats whats causing it. I know it backfires has happened a bunch of times, the part that freaks me out is that it has a small hesitation when it does backfire. And my question is, if that can harm anything motor wise.
-Joel
-Joel
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From: Miami, Fl. - Hurricane Highway
But could the colder weather have anything to do with it. Because last week when it was hot i didnt notice this, yet last night and today its been pretty cool and it has happened?
-Joel
-Joel
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Originally Posted by ZL1Killa
if you haven't gotten a tune then its probably rich...normal WOT at 6krpm is 11.7AFR(i think) if not it is around 12 something.
I run my car around a 12.9 at low rpm and up to a 13.2 up in the rpms..then back down to 12.9~13.0 around 6k
I run my car around a 12.9 at low rpm and up to a 13.2 up in the rpms..then back down to 12.9~13.0 around 6k
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From: Miami, Fl. - Hurricane Highway
Well when i installed the headers the guy i bought them fom who posts on here told me i should get a tune because i will be running rich. And when i dynoed the car, the guy that did it even said it was running rich. If its running lean then i may be in a world of **** then.
-Joel
-Joel
You could be running lean at part throttle, which would make your fuel trims go up, which in turn would make you go way rich at WOT. WOT is where you dont want to be lean. Part throttle lean isnt as bad, but may give you some K/R.
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From: Miami, Fl. - Hurricane Highway
But the thing thats weird is that it only happens when i go WOT into 3rd gear. It backfires im assuming and gives a slight hesitation when it does then keeps on climbing with no problem.
-Joel
-Joel
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From: Miami, Fl. - Hurricane Highway
Ok on my way home i tried the cruising in 3rd and going WOT. Basically nothing happened car ran like normal all the way up to 6K. Didn't backfire or hesitate in any way.
-Joel
-Joel
Originally Posted by 2000Hawk
Ok on my way home i tried the cruising in 3rd and going WOT. Basically nothing happened car ran like normal all the way up to 6K. Didn't backfire or hesitate in any way.
-Joel
-Joel
Obviously the best next step would be to wide-band it to see for sure, but you can do a couple of quick things to test the theory.
Cars generally run very well when lean in the lower gears, but in higher gears the added load causes lean misfires and/or surging. That means that going through the same RPM range in fourth gear should also show the problem again, but probably worse.
You could also take a look at all of your plugs and look for signs of heat or white crust. On a lean tune, tightening up the plug gaps to .028" - .032" will cut down on the misfires. If that fixes the problem then it's likely you were lean.
Other possibilities are more remote, like a weak lifter that pumps up, or loose electrical connection. Scanning the car during this pop might show something as well.
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From: Miami, Fl. - Hurricane Highway
Well i think it was the weather, because last night i went WOT a few times and it didn't happen. And it wasn't cool one bit. I am going to buy an AEM Wideband anyways, so then i'll finally be able to see what im running.
-Joel
-Joel
