ok guys and gals i was driving my lt1 powered rx7 yesterday and it was fine until it got to temp. if i floor it, the car is fine. but if i am at low rpms just cruising and then i step on it the car seems like it has no power for a second and it sounds like its miss firing a little but then it goes. i also discovered that my exhaust manifold gasket has a small tear on it and exhaust is getting out from there. it only does it when i need to power for example in 4th or 5th gear and i am going up a hill or something and i step on it not a lot just enough to get me up the hill and it hesitates some but if i drop it to 3rd or 2nd and step on it its fine. think the exhaust manifold gasket is the cause of this problem or is there something else? i have tuner cat for my car but i can't seem to figure out where to find the error codes with tuner cat. i have no CEL or Error codes and i am completely lost! fuel pressure sits right at 42 psi like the day i first put it in. i have a walbro 255 in the tank and it runs just fine. spark plugs are brand new not even 25 miles on them along with the plug wires. any ideas??

 

bad o2's imo

o2's are not used during open loop (before car reaches operating temp approx.) o2's are also not used at WOT

 

ok good point i never thought about that. i am going to try to get them off tomorrow and replace them by the end of the week see what happens! thanks man!

 

after finally getting under the car it turns out that it was a bad 02 sensor after all


swapped it out with two new ones and she is back to normal!