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The following is my situation and problem. Any thoughts or comments from those more knowledgeable would be greatly appreciated:
Car: 2006 Elise
Miles: 11,300 (7,000 from prior owner, the rest are weekend, no-track miles)
While bedding in new front brake pads (accelerating and braking repeatedly), MIL came on. Bought scan tool, which returned 1301 and 1302 codes. Checked cams and no premature wear or rocker problems. Cleared the codes and car ran fine for next two trips. Last Saturday, drove car for about an hour and let it idle for about 20 minutes while I hooked it up to the scan tool. There were no codes and the car idled fine the whole time.
Started car the next day and let it idle for about 5 minutes while I checked the tires other odds and ends. Just as I was going to get in, car started idling roughly, went into limp mode, and then died. Codes were 1301, 1302 and cylinders #2 & #4 misfire. Cleared the codes and restarted. Idled fine for about 5 minutes and then started idling roughly. It seemed to "snap out of it" briefly when I hit the accelerator, but then went back to idling roughly. It then went into limp mode again and stalled. Codes were the same thing (same cylinder misfires). Bought new spark plugs and installed (coil packs looked fine). Cleared codes and went for about a 30 minute drive. No codes, no rough idling at any stop lights. Returned home and let it idle in the garage. After about 3 minutes, it went through the same cycle (rough idling, MIL, limp mode, stall). Codes were again #2 and #4 misfire.
I can't figure it out and I don't have much hair left to pull out. The car ran perfectly on the road. I even hit the 2nd cam 3 times and it behaved perfectly. It's like it has forgotten how to idle after a couple minutes. I unhooked the battery last night and will re-attach today in the vain hope it will "clear" the ECU and perhaps fix the situation. Could it just be a bad tank of gas?
Car: 2006 Elise
Miles: 11,300 (7,000 from prior owner, the rest are weekend, no-track miles)
While bedding in new front brake pads (accelerating and braking repeatedly), MIL came on. Bought scan tool, which returned 1301 and 1302 codes. Checked cams and no premature wear or rocker problems. Cleared the codes and car ran fine for next two trips. Last Saturday, drove car for about an hour and let it idle for about 20 minutes while I hooked it up to the scan tool. There were no codes and the car idled fine the whole time.
Started car the next day and let it idle for about 5 minutes while I checked the tires other odds and ends. Just as I was going to get in, car started idling roughly, went into limp mode, and then died. Codes were 1301, 1302 and cylinders #2 & #4 misfire. Cleared the codes and restarted. Idled fine for about 5 minutes and then started idling roughly. It seemed to "snap out of it" briefly when I hit the accelerator, but then went back to idling roughly. It then went into limp mode again and stalled. Codes were the same thing (same cylinder misfires). Bought new spark plugs and installed (coil packs looked fine). Cleared codes and went for about a 30 minute drive. No codes, no rough idling at any stop lights. Returned home and let it idle in the garage. After about 3 minutes, it went through the same cycle (rough idling, MIL, limp mode, stall). Codes were again #2 and #4 misfire.
I can't figure it out and I don't have much hair left to pull out. The car ran perfectly on the road. I even hit the 2nd cam 3 times and it behaved perfectly. It's like it has forgotten how to idle after a couple minutes. I unhooked the battery last night and will re-attach today in the vain hope it will "clear" the ECU and perhaps fix the situation. Could it just be a bad tank of gas?