does any of this explain bad mpg?
Thread Starter
TECH Fanatic
Joined: Mar 2011
Posts: 1,050
Likes: 2
From: Odessa, TX
does any of this explain bad mpg? https://ls1tech.com/forums/16315948-post63.html
hoping some graph savvy people can tell me if this is all ok or if theres a problem
hoping some graph savvy people can tell me if this is all ok or if theres a problem
I'm not sure what those 02 readings are even saying....but I would get it scanned with an OBDII....see how the 02 sensors are switching with the engine idling.
Its just about the biggest culprit with our cars to KILL gas mileage. I've seen many guys with a bad sensor thats just in the failing stages (AND NO CODE WILL POP) and they get around 150 miles per tank.
Bad MAF won't effect gas mileage. I had mine unplugged for two years and had zero change in mileage, power idle, nothing changed. MAF's are unnecessary, at least in my car....lol.
Other than that:
Leaky fuel injector(s).....but you will usually have a misfire at idle or low rpms.
Fuel leak somewhere....easy to find.
.
Its just about the biggest culprit with our cars to KILL gas mileage. I've seen many guys with a bad sensor thats just in the failing stages (AND NO CODE WILL POP) and they get around 150 miles per tank.
Bad MAF won't effect gas mileage. I had mine unplugged for two years and had zero change in mileage, power idle, nothing changed. MAF's are unnecessary, at least in my car....lol.
Other than that:
Leaky fuel injector(s).....but you will usually have a misfire at idle or low rpms.
Fuel leak somewhere....easy to find.
.
Oh, also in the 1998's....a failing coolant temp sensor will cause the engine to run like amazing ****. My engine literally will not run for more than 5-10 seconds with a bad one. Thats why I carry a spare with me....lol A failed one is enough to get me stuck in the boonies.
Not sure about the 2001 PCM's........
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Not sure about the 2001 PCM's........
.
Thread Starter
TECH Fanatic
Joined: Mar 2011
Posts: 1,050
Likes: 2
From: Odessa, TX
i pulled all that data with my obd2 scanner. no codes. new o2s less than 1k on both. (could be a dud) the scanned showed them switching but im not sure what proper switching looks like.
i have a 98 ls1 in my car. i dont have a misfire. there is a slight stumble at idle every now and then. seafoam cause it to not be as noticeable.
i have a 98 ls1 in my car. i dont have a misfire. there is a slight stumble at idle every now and then. seafoam cause it to not be as noticeable.
i pulled all that data with my obd2 scanner. no codes. new o2s less than 1k on both. (could be a dud) the scanned showed them switching but im not sure what proper switching looks like.
i have a 98 ls1 in my car. i dont have a misfire. there is a slight stumble at idle every now and then. seafoam cause it to not be as noticeable.
i have a 98 ls1 in my car. i dont have a misfire. there is a slight stumble at idle every now and then. seafoam cause it to not be as noticeable.
I put new 02 sensors in in January. Brand new Densos. One was a complete dud.
.
Also, make sure none of the spark plug wires are touching any part of the metal exhaust manifolds.....that will cause misfires at all different rpms. But at idle it'll happen almost always.
.
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