Okay so about a month ago my buddy and I decided to take a 2 hour drive to try out an 88 M3. Upon seeing/driving the car (it was a POS) I couldn't wait to get back into my 318i for the drive home.
As we headed out to lunch the car started bogging down, throwing a CEL when climbing inclines, and generally running shitty. It had thrown a brief CEL on the way to work a few weeks earlier (same bogging feel for a few seconds).
After getting home I ran the stomp test and got 1222 code, which research says can be vacuum related. So I pop open the hood and listen and can hear hissing from the snake of hoses under the intake.
So I ordered all parts for the overhaul and did the following:
Removed all extra coolant/vacuum hoses
Ran new hose from ICV to intake boot (put a connector in the center of the hose to prevent it from collapsing))
Ran new hose from valve cover to port under throttle body
Cleaned out injectors, new seals
Cleaned ICV
Cleaned all the oily crap out of the intake system
Replaced valve cover gasket (including those damn grommets for the vc bolts...ouch)
New spark plugs, air filter, oil change
New gaskets for intake and throttle body (I left the hold heater plate on without anything connected to it)
Couldn't believe how smooth the car ran. On my test run it was perfect until I decided to push it. On a redline shift (6900 have Dinan chip) from 1st to 2nd car bogged just as LSD kicked ass end in line, and CEL lit up. Ran crappy for about 30 seconds and then smoothed out.
At home ran stomp test and now got a 1221 code (oxy sensor). Thought that perhaps I'd introduced a vacuum leak with the hard shift (engine rocked, pulled on the intake boot and let extra air in), so I decided to take it easy.
Ran good for about a week and now it has started flashing CEL about 3 minutes after startup. I can tell when it is going to happen as the car stumbles about 20 seconds prior to the code flash. Weather has been colder in the morning.
Any thoughts were I should begin? I did attempt to replace the header to cat gasket several years ago, but snapped one of the studs (flange at header to cat) in the process and left it alone. Car does have a slight exhaust leak there I believe.
As we headed out to lunch the car started bogging down, throwing a CEL when climbing inclines, and generally running shitty. It had thrown a brief CEL on the way to work a few weeks earlier (same bogging feel for a few seconds).
After getting home I ran the stomp test and got 1222 code, which research says can be vacuum related. So I pop open the hood and listen and can hear hissing from the snake of hoses under the intake.
So I ordered all parts for the overhaul and did the following:
Removed all extra coolant/vacuum hoses
Ran new hose from ICV to intake boot (put a connector in the center of the hose to prevent it from collapsing))
Ran new hose from valve cover to port under throttle body
Cleaned out injectors, new seals
Cleaned ICV
Cleaned all the oily crap out of the intake system
Replaced valve cover gasket (including those damn grommets for the vc bolts...ouch)
New spark plugs, air filter, oil change
New gaskets for intake and throttle body (I left the hold heater plate on without anything connected to it)
Couldn't believe how smooth the car ran. On my test run it was perfect until I decided to push it. On a redline shift (6900 have Dinan chip) from 1st to 2nd car bogged just as LSD kicked ass end in line, and CEL lit up. Ran crappy for about 30 seconds and then smoothed out.
At home ran stomp test and now got a 1221 code (oxy sensor). Thought that perhaps I'd introduced a vacuum leak with the hard shift (engine rocked, pulled on the intake boot and let extra air in), so I decided to take it easy.
Ran good for about a week and now it has started flashing CEL about 3 minutes after startup. I can tell when it is going to happen as the car stumbles about 20 seconds prior to the code flash. Weather has been colder in the morning.
Any thoughts were I should begin? I did attempt to replace the header to cat gasket several years ago, but snapped one of the studs (flange at header to cat) in the process and left it alone. Car does have a slight exhaust leak there I believe.
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