another running lean at wot, with cylinder 4 misfire

[joe sobo]

i have searched, but nothing really pionts to a cause. every post i see, they are running other than stock setup.
when i drive the car, it runs fine, then randomly loses alot of power, then check engine light came on. so i floored the gas, and my aem wideband shows that the car is running extremely rich(to where it just shows the dotted line).
i just bought the car with a busted timing belt, and had to get the head redone.

 

[babyviper]

Sounds like you need to go back over your work. Check the t-belt, the CAS to make sure there on right, and figure out why the check engine light came on. I would also do a compression test to make sure the Head gasket sealed. It sounds like the motor felt some type of knock and it pulled timing.

 

[joe sobo]

the check engine light code is for cylinder 4 misfire
well, i thought to check the timing again, but because the problem comes and goes, i would think that it would be more electrical? yes, no?

 

[narf]

plug wire? coil pack? clips on the injectors secure? Could you have an injector with a failing coil? There are alot of possibles with just a misfire # code.

 

[JEFFREYCASTGSX]

Your aem wideband maxes out at 10:1 anything below and it wont show it, the funny part is that our cars are supposed to be run at around 9.?:1 at WOT.

 

[joe sobo]

Your aem wideband maxes out at 10:1 anything below and it wont show it, the funny part is that our cars are supposed to be run at around 9.?:1 at WOT.

right, but it is running lean , past 17:?1. at wot.

so, i let the car cool down for the last hour, and i just just let it warm up for like 2 minutes, and then blasted it down the road, and it ran,boosted, and richened up like it is suppose to. i have new wires, plugs. but i do not have those clips that hold the injector wires on.i checked them anyway, and they did not pop off

UPDATE
ok, so i put new plugs, new wires. i am still getting the cylinder 4 misfire. so i swapped my injectors around. i switched 3 and 4. this also did not help at all. it still says cylinder 4 misfire.

does anyone have any experience with this problem.?

 

[pj91gsx]

flush your injectors.

 

[joe sobo]

well, the problem is that if i shut the car off, and start it right back up, it will be fine for a period of time

 

[babyviper]

What kind of plugs are you using?

 

[joe sobo]

ngk's

 

[babyviper]

NGK bpr6es or 7es?

 

[joe sobo]

bpr 6es

 

[jeffo]

What is the EXACT code you are reading? It sounds like you may actually be getting a P030X code for Random Misfire because of your lightened flywheel perhaps.

 

[babyviper]

You need to run br7es or bpr7es I would recommend br7es because of the not protruded tip giving you room for error (overboost). Bpr6e s plugs are to be never used after you upgrade you intake or exhaust and you have done both. I have personally experienced a problem running bp6es plugs with only an intake an hard piping. It missfired no matter how often I changed the plugs. Soon as I switched to 7's I had no more problems.

 

[joe sobo]

what is the exact code you are reading? It sounds like you may actually be getting a p030x code for random misfire because of your lightened flywheel perhaps.

i was getting code p0304

You need to run br7es or bpr7es I would recommend br7es because of the not protruded tip giving you room for error (overboost). Bpr6e s plugs are to be never used after you upgrade you intake or exhaust and you have done both. I have personally experienced a problem running bp6es plugs with only an intake an hard piping. It missfired no matter how often I changed the plugs. Soon as I switched to 7's I had no more problems.

i have since put bre7 in, and now have no more misfire