EFI bronco runs great, but idle is a little wacky?

[70EB]

Seems there is an idle issue with the E303 cams:

http://forums.corral.net/forums/showthread.php?t=1141341&highlight=e303+idle

Might want to look at your lean O2 code. A rich or lean condition can cause idle surging. What is your fuel pressure?

 

[NJB71]

dont know, bought a fuel pressure gauge, and didnt realize it only measures up to 10psi...useless, ty it only cost $10.....i will go and buy the right kind, let say fuel pressure is under 40psi(especially if surging), how do I increase it? I have the bcb in tank FP

 

[Bronco_69]

you have to have an adjustable FPR to adjust it. Kirban is a good FPR and the little red one that looks factory is a POS.

you can use a cheap tire gauge on the shrader valve if you want to check the pressure. i would not use any tire gauge that i cared about though. you check the FP at an idle with the vacuum line removed from the FPR.

exhaust leaks and loose or old O2 sensors can cause the lean condition.

 

[NJB71]

you have to have an adjustable FPR to adjust it. Kirban is a good FPR and the little red one that looks factory is a POS.

you can use a cheap tire gauge on the shrader valve if you want to check the pressure. i would not use any tire gauge that i cared about though. you check the FP at an idle with the vacuum line removed from the FPR.

exhaust leaks and loose or old O2 sensors can cause the lean condition.

Ty Bronco_69 I do appreciate your help, i just bought the Kirban, going to sears tonight to buy FP tester...I'm starting to wonder w/ my cam, since the car idles great at 1000-1100 rpm, the vac is strong, and hence better fuel pressure(ofcourse i wont know until i get a tester on), if thats the case the kirban adjustment should compensate right? and as for lean code, I did have a small exhaust leak where the o2 sensor was, i fixed that, I have not rerun test yet- i have been focusng on fixing idle surge, the o2 sensors are new...need to do a koer test as well

 

[ransil]

Harbor freight has a Fuel pressure gauge cheap that gets the job done.

 

[NJB71]

Harbor freight has a Fuel pressure gauge cheap that gets the job done.

Ty, kinda want to get it in my hands tonight, so sears still a choice

 

[bronco-billy-66]

after market mass air meters can also be a issue and need to be clocked or tuned.

Does a stock MAF have to be clocked a certain way? Ive heard about this before but never really understood why..Can someone explain it?

 

[70EB]

Seems to be more of an issue with forced induction or cold air kits but numerous forums suggest clocking the MAF to cure some idle surge problems.

Number 8 in the link below about surging idle briefly discusses it.

http://www.stangnet.com/mustang-forums/698148-help-me-create-surging-idle-checklist.html

 

[NJB71]

Seems to be more of an issue with forced induction or cold air kits but numerous forums suggest clocking the MAF to cure some idle surge problems.

Number 8 in the link below about surging idle briefly discusses it.

http://www.stangnet.com/mustang-forums/698148-help-me-create-surging-idle-checklist.html

I read this earlier ttoday, doing lots of idle research...i thought about clocking MAF, i have a giant air filter on end of MAF that faces close to battery/cooling fan....i thought about buying a closed face cone filter and a sheild that covers bottom 1/2, i will clock MAF tonight see if it helps, I did change 02 sensor which honestly helped, now the surge is 900 to 1000rpm, again i drove bronco for 1/2 hour and at stop light idled smooth. still need to check fuel pressure, waiting for part to test, also ajustable TPS(in mail), and frankly i still dont think i set base timing correct, would she drive smoth w/o proper setting?

 

[70EB]

I think we are at the point where we are stabbing in the dark until some of your stuff arrives.

I have a cone type filter with nothing blocking it from the fan and don't have an idle problem.

 

[NJB71]

I think we are at the point where we are stabbing in the dark until some of your stuff arrives.

I have a cone type filter with nothing blocking it from the fan and don't have an idle problem.

yes ur right, i am going to drive her until everything comes, and go thru all issues, tps, FPR, etc...all in all she drives awesome, so at least i am not frustrated....btw where have I seen your bronco before?......RJM webpage?

 

[70EB]

Yep. I had the exterior grey color when I did the EFI swap.