What would cause one side of my engine to be lean?

[BlackFox5.0]

I have been having a bucking (miss) problem lately. I took out all my plugs and looked at them and the passenger side of the engine had white ground straps on the plugs, the dirvers side were just normal looking, the tanish brown color.

I did pull the upper off to change my FPR, and I lifted the rail torwards the back of the engine (closer to the firewall) and that one injector came out of the intake I think.

Could I have a clogged injector or something? I can't figure it out

 

[blown93feature]

I don't understand why the pass side is lean looking it's usually the driver side cylinder 7&8 and number five is usualy the one that gets left out of everything.I see that you have a "A" with a 306 and 36"s very nice.I didn't see you mention fuel pressure on wot do you know what it is?

I have 30"s with an s and factory fuel system except for the 2 255 pumps and I run the ffpr and have no chip or fmu at the time of dyno last week and If you want to see lean how about 14.7/1 can you say omg...I have put the fmu back on and were going back tomorrow and shooting for 500.Just for reference all my plugs were grey at the time of dyno and the best way to check plugs is right after you run the car at wot this way the motor dosen't have a chance to change the appearence of them.

edit" I forgot to ask what gap are you running and temp rated plug.I would check your plug wires to see if one is loose or arking.I run my gap around 38 to 40 thousands and use autolite 3923 plugs perfect set up..

 

[BlackFox5.0]

I have a stock regulator right now, I'm putting my adjustable one back on as we speak, I also sprayed out the screens in all the injectors, and swapped the drivers side over to the passenger.

I have Autolite 23's for plugs gapped at .035"

Plug wires are fine, just checked them. All plugs are firing.

I also have a high pressure Walbro (holley) 255lph pump

 

[Mustang5L5]

O2's?

Didn't you say 1 was original? They tend to fall out of calibration after so long

 

[BlackFox5.0]

Yeah but I checked the output voltages, and they were ok. I am going to tune my FP and see how it turns out, when I just started it cold, it didn't stutter like it usually does, so maybe I fixed it...I'll post back...

 

[Mustang5L5]

The output voltages may be good, but it could be reading lean as good if ya know what i mean. That's why i said the calibration tends to go off. It might think it's reading ok when it's not

 

[BlackFox5.0]

Well it drives a little bit better, it seems to buck when I go down hill with my foot still on the pedal and not giving it any more gas. I set my FP to around 53psi.

I think i should change the O2's soon too....

 

[Mustang5L5]

Just give me your supercharger. I think it will be happy on my car. I'll trade you my 02's in return!

 

[BlackFox5.0]

You don't want it, it makes more problems. I didn't expect to spend so much more money after I got it

 

[HISSIN50]

Chris, im with Mike on this one too. the Fuel pressure is a reflection of the primary delivery - if you have too little pressure, both banks are affected the same (more or less). since you are lean on one bank, i would look for things that are bank specific....like the lambda on that side.
someone in here has a thread where they say that they get O2's for 30 bucks each...im waiting for them to reply to see where they got them for that price (and it better not be 30 bucks plus 10-15 for shipping!).....i will post that info on your thread if it ever is revealed....

good luck.

 

[BlackFox5.0]

Thanks. It did get better for sure, but I can feel it mostly in 5th gear and cruising around 2000-2500rpm I'll have to see what the plugs are like now.

I've gotta fix this before saturday!!!!!!!!!

 

[blown93feature]

Chris, im with Mike on this one too. the Fuel pressure is a reflection of the primary delivery - if you have too little pressure, both banks are affected the same (more or less). since you are lean on one bank, i would look for things that are bank specific....like the lambda on that side.
someone in here has a thread where they say that they get O2's for 30 bucks each...im waiting for them to reply to see where they got them for that price (and it better not be 30 bucks plus 10-15 for shipping!).....i will post that info on your thread if it ever is revealed....

good luck.

I get my 02's for 36 bucks @autozone can't beat it!!!

 

[blk9450]

i was amazed the other day when i bought o2s at autozone. i remember at the other place by me like 2 years ago the things were like $80 each. bosch units too autozone=

 

[HISSIN50]

Blown, thanks for the info. i should do them, if i ever get off my butt.
thanks again!

 

[BlackFox5.0]

Ok, I unplugged my O2s, and the car is bucking more than withthem plugged in....what does that say?

My friend just did O2s on his car and gave me the ones he took out to test on mine, He said one sensor is like 6 months old. If it's nice out today I am going to put them in and see what happens

 

[astronut1885]

I got new Denso O2s for 45.00 a piece at a local store, and they helped calm my idle alot. Hopefully my fuel mileage will go up with working O2s in the system. Good luck with my old ones chris.