E303 Camshaft lope

i dont think that would be caused by the cam because that cam is pretty mild, it may be your mass airflow meter though. check it out

whats the timing set at? check and make sure its not too low. @ what rpm is it at idle? not sure exactly what rpm but it should sit some where between 500-1000. im sure others chan jump in here and give more help.

When it does idle ok, it's right around 1000 rpm, but it usually jumps from 500 to 1500 when it lopes. The timing is set at 14 btdc. The MAF sensor looked ok, but is there something I should be looking for? I was also thinking that I might not have enough fuel pressure.

Any thoughts?

rx750 said:

When it does idle ok, it's right around 1000 rpm, but it usually jumps from 500 to 1500 when it lopes. The timing is set at 14 btdc. The MAF sensor looked ok, but is there something I should be looking for? I was also thinking that I might not have enough fuel pressure.

Any thoughts?

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It may be a charging issue, but it also could be an IAC issue. Possibly a combination. Are you able to pull codes?

your problem is probably an air problem at idle. there is a spacer that you can install inbetween the IAC and the throttle body that can fix your problem. i had the same problem untill i got the spacer. i dont know where to get one cuz a guy at my work had one. but it has set screws in it that you can adjust and it basically will adjust the amount of air that the IAC will let in at idle. or i believe you might be able to drill a small hole in your thottle plate to allow more air in but i dont remember what size drill bit you need...

If the idle is set to 500 then its too low. I have the same cam and anything less than 800-1000 idle and the car is fairly unhappy. Its also more problematic if its on a auto car.

How about the fuel pressure.
Also, how does it run when you unplug the IAC?
You can also try disconnecting the battery for 30 minutes or so, and see if that clears it up some - in case you've been tweaking on the idle screw.
The throttle plate may be too open, or too closed.

It doesn't run at all if i unplug the IAC. I've already tried unplugging the battery. I'll look into the spacer plate and the fuel pressure. Any other thoughts?

rx750 said:

It doesn't run at all if i unplug the IAC. I've already tried unplugging the battery. I'll look into the spacer plate and the fuel pressure. Any other thoughts?

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Try adjusting your idle screw to open up the throttle some more. I think it should idle lower, but steadily, without the IAC. Mine does, but then I don't have a big cam, also...

you should try to avoid adjusting the idle stop screw unless you cant get the idle adjustment plate (which i believe they at brothersperformance.com) and btw meangreen92, if you unplug your IAC and the motor doesnt sputtur and die then your IAC is clogged up and is sticking. but try that website because i believe they sell it there and that will fix your problem because if it runs like that with low fuel pressure at idle then you wouldnt have any power if you drove it. the 5.0's and eec-4 is so touchy to things other than stock. i put only an intake on mine and i couldnt get it to run right and it ran just like what you are talking about and as soon as i put the plate on it went away and havent had the problem since.

green91 said:

and btw meangreen92, if you unplug your IAC and the motor doesnt sputtur and die then your IAC is clogged up and is sticking.

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Thanks for the info, I will check it out tomorrow.

Ok, I'll try installing the spacer plate and let you know on the results. thanks