hesitation and sputtering, cant figure out what it is any opinions? Options

[easternpiro1]

Hi all! i have been having an ongoing problem with my swap when driving. I get a weird hesitation/sputtering when trying to accelerate.

the problem happens more when im on the highway at a steady cruise, my AFR goes blank (reads ---) and car hesitates/sputters. when i get on the gas it stops.

after recently having the car sit for about 9 days i started her up and took it for a drive, upon initial acceleration (1st and 2nd gear) car sputtered and hesitated real bad, but after the car was driven for a while it pretty much stopped. its rough initially then smooths out when car is warmed up.

any ideas as to why this may be happening would be appreciated!

car is running on stock waste gate pressure at the moment (8psi) IC piping seems to be ok... could it be a fueling issue? it may be leaning out. Cam (boosted185) says I just need to tune it as the pistons are SLIGHTLY larger than stock pistons when he rebuilt the motor.

[bsamps4]

What fuel pump are you using?

[malecrod]

Hi Matt, i know it sounds simple but make sure you don't have a leak. Especially if you have a BOV. It could be that simple. Its happened to me, same thing and on the highway, turns out to be the bov.

[x_itchy_b_x]

o2 sensor possibility. sounds rich to me. is it speed density or AFM?

[easternpiro1]

you guys wont believe this... i got stuck on the side of the road, car was sputtering a bit while i was on my way to an appointment. but was ok.

on my way back i COMPLETELY lost power but electrical systems inthe car seemed ok. gave ol dr. tweak and camshaft cam a call and find out its the EFI fuse.... So i manage to get another one, and go about my way thinking all is well... BOOM it blows again... and SEVERAL more times on my way to my destination.

I noticed everytime that i put a new one in, i didnt get the sputtering, but it would progressively get worse before the fuse blew. I checked all lined from the fuse box into the harness nothing seemed to be causing a short.

eventually It got to the point where i couldnt even put the car in gear to take off before the fuse would blow. I messed with the fuse box, looked under it at the connections to the harness and raised the box up a little bit (to keep pressure off the wires) and there was no problem!

only thing that happened after that was i was running very rich, and could smell gas. the car also rev's higher, and after i got on it one good time it began giving me that "honda rev" when i was at a light.

Its behaving itself now with the exception that its burning gas worse than before and my vaccum at idle is 16-17.


Sorry to type so long... but to answer the questions: Sam" im using a walboro 255, malecrod im beginning i have a leak in additon to whatever electrical problem is going on, and itchy balls, the car is MAP sensored

this is pretty wierd as it never happened before just got bad all of a sudden!


It was suggested by cam that i unplug each body plug under the dash adn plug each one in one by one until the fuse pops... will try that if it starts up again

[bsamps4]

Now that is the 15amp fuse that you are referring to right? How is your fuel pump relay wired? Is your efi relay sticking shut? Do you have a poor connection to your battery? Is your COR shorting?

[easternpiro1]

Now that is the 15amp fuse that you are referring to right? How is your fuel pump relay wired? Is your efi relay sticking shut? Do you have a poor connection to your battery? Is your COR shorting?

yeah its the 15amp. im not sure how the fuel pump relay is wired, tweak or cam did the wiring, im pretty sure the connection to the battery is okay though. it has sputtered/hesitated once since i adjusted the fuse box. what is the COR? i will check that out as well.

[bsamps4]

COR= circuit opening relay. Sounds like you need to find a short somewhere.

[easternpiro1]

COR= circuit opening relay. Sounds like you need to find a short somewhere.

yeah, tomorrow i will unplug each body plug to the ecu and see... im thinknig its a short right under the fuse since when i moved the fuse box a bit to look under it, it stopped doing it. actually ben, my brother is in durham with his toddler twins, im tempted to ride up that way!

This post has been edited by easternpiro1: Mar 24, 2012 - 3:11 AM

[bsamps4]

I'm here all weekend!

[lagos]

Sounds like problem with the rewired wiring harness.
Either that circuit is grounding out (exposed wire where tweak made the rewiring for the swap), or something is wired to that circuit that shouldn't be, and causing too much current draw.

Unwrap all of the electrical tape and look at the wiring around the ecu for any loose or exposed wiring. If that checks out, unwrap and take a look at the wires leading to the fuse box.

But the best thing would be to contact tweak since hes the one that did the wiring.

[easternpiro1]

Sounds like problem with the rewired wiring harness.
Either that circuit is grounding out (exposed wire where tweak made the rewiring for the swap), or something is wired to that circuit that shouldn't be, and causing too much current draw.

Unwrap all of the electrical tape and look at the wiring around the ecu for any loose or exposed wiring. If that checks out, unwrap and take a look at the wires leading to the fuse box.

But the best thing would be to contact tweak since hes the one that did the wiring.

Im thinking the same, as i took each plug from the ECU out, and plugged back in but nothing blew the fuse.

the car drives better after i readjusted the fuse box, but from time to time i will still get hesitation when im just cruising. It wont really do it when im romping on it but only right after.
I will check under the fuse box to see again if there is anything exposed and check out wiring and call tweak.

will keep ya'll updated!

This post has been edited by easternpiro1: Mar 26, 2012 - 7:05 AM

[PhoenixTech]

Hey Matt,

Did you get anything figured out with your car? haven't heard from you since my birthday, so I'm going to assume yes haha. Make sure the plugs under the fuse box are securely snapped into place as well, and the cam-lock on the oval-ish connector is locked into place as well. That fuse box has been in and out of that car so many damn times who knows how worn those connections are.

-Cam

[easternpiro1]

thanks cam! It actually stopped for a while, then resumed again. i noticed that it happens when it rains, or if i just start the car and take it up the block (getting on it) it really only happens in 1st-2nd gear, and my AFR goes lean, and my boost dosent build i hear air beign sucked in but no acceleration then BOOM it kicks in. going to check the plugs again!

I tried to call on tuesday! no answer i'll hit u up in a bit, wanna see that SC!!!

[PhoenixTech]

Hey Matt, I can't remember if I asked you this before or not...when it does start sputtering, does the CEL flash at all or come on? Try pulling your codes and see if there's one there, even though the CEL isn't on all the time.

-Cam

[easternpiro1]

nah, no cel codes, it happens when im at very light throttle cruising and sometimes when the car is cold. its so sporadic when it happens though i will pull codes to see whats going on today

[Stambo]

i have the same problem, It happens so randomly. Its like it always happens on the 2nd last monday of the month only at night kinda thing lol

[easternpiro1]

lol im going to change spark plugs this weekend and see if it has any codes i didnt notice. it definately has to be a wiring or fuel issue, i will hear it spool, see the AFR go rich, see the boost gauge go up, but no acceleration sometimes.

This post has been edited by easternpiro1: Apr 13, 2012 - 5:36 PM

[Stambo]

^^ exactly what happens to mean, the motor is still creating boost but no go. Then it'll pick it self back up off its face and pull hard.