Hello....looking for some advice on my '03 SE7 with 93k....I developed a miss and rough idle and triggered code P1300 and misfires on Cyl. #1 and #5..I was on a long trip and I started to get a blinking CEL going uphill....but the engine never overheated......it did have the original wires..I was loosing coolant and oil....
I changed the wires, plugs, and replaced the gaskets from the lower intake manifold up...I found a coolant leak at the lower intake gasket...and the oil loss was from loose valve covers....
After I fired her back up she ran great...but I get P0300 and P0301 codes and it idles very rough...also, at ~ 1,250 RPM the CEL blinks until I give it a little gas and the light goes out....usually comes on going up any type of uphill grade and sometimes right at start-up........I triple checked the wires, I am not loosing coolant, and no coolant in Cyl. # 1......I was doing a bunch of searches and I see MAF's could cause this...any thoughts..thank you!!!.....Dan

 

what are the exact codes you are getting now?

 

This weekend I cleaned the Bank 1, Sensor 1 O2 connector as it was covered in oil from my valve covers....I cleared the codes.....so after ~ 3 days of driving I have a P0301(cyl. 1 misfire) and a P0135(o2 heater circuit, Bank 1, Sensor 1)...and a blinking CEL a few times....Also, I changed all the O2 sensors ~ 65k.....thank you!...

 

I too replaced my O2 sensors at 68K. You might try pulling the two front O2's and cleaning the carbon off them. I replaced the front right O2 again at 88k and it cured my bad idle. Cleaning them is free and they could be foweled up since it has been running rich/lean. I have not found a good answer for testing a bad ignition coil or MAF. Other than if it throw the MAF code.

 

Update after being out of town for a few weeks.....I replaced the front O2 sensors again to see if this would solve the problem.....very quickly I get the P0301 Cyl. 1 misfire code again...and the CEL still blinks at low RPM......I am at a loss.....any help would be greatly appreciated!!!!...thanks Dan..

 

Update to the update....not sure what else to do....so...I installed a new MAF, LR model....still idles rough and the blinking CEL is on.....only code is a Cyl 1 misfire....any thoughts at all?.....I read some other posts about switching wires to see if it was the cyl or wires/coil....which one would I swap with #1?...

thank you!!...

P.S. For sale - used MAF Sensor...tested good..

 

have you done your head gaskets? from the pic it looks like you are losing coolant.

 

Send me your tele number and I'll walk you thru what to do.