lookatdalude

i have a chipped p28, supposed to be chipped for intake, exhaust, header......i plugged it in and car wont run above 4k jus sputters and backfires, plus it wants to idle around 2200rpms..... could it be the ecu? or did the guy that wired the vtec up in my car mess it up?

i have a 92 lude with JDM h22a, currently i took out the p28 and am running the stock p14 with no vtec, but i need to get this problem first

rayslude

Get a P13, problem solved.

If you want to stick with the P28, it will work, but you need to get it retuned. Never buy a pre-tuned ECU expecting it to work right out of the box.

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lookatdalude

i have a jdm p13 from an auto, it wouldnt work, dont know if it should or not tho with the car bein a manual

rayslude

it'll work, unplug the battery switch ECU's and plug the battery back up

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lookatdalude

it didnt work either, i tried it before i bought the p28, but i cant remember what it did with the p13 in it, i will check later on today and let you know

lookatdalude

ok i got the p13 auto ecu in.... vtec is engaging, but when it kicks in it sputters really hard for about 1-2 seconds then pulls like crazy..... any ideas what could be wrong??
its not getting any CEL codes either

rayslude

check all the essentials starting with the plugs. This p13 doesnt have a chip in it does it? if so, take it out.

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lookatdalude

nah, no chip, new ngk plugs, the wires are good, i think i need a fuel filter........but i noticed something else last nite, it runs horrible on a cold startup, doesnt even wanna stay running, but then after i drive it for a lil while and it warms up, it runs a lot better, so i dont know

lookatdalude

any ideas?

natemanas

I am dealing with sputtering issues too, and I've been told to check:
•compression
•sparkplugs
•Timing
•primary o2 sensor
•TPS
•Knock sensor
•EGR and EGR ports
•IM ports
•Fuel Filter
•fuel pump
• distributor cap and rotor

I hope that stuff helps you out.

Nate

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I used to be different, Now I'm the same.

lookatdalude

yeah i wish it wasnt my daily driver tho, cuz then i could jus replace everything and go with trial and error, till i fixed it, but i cant afford to do it all at once, and i can only work on it on my days off that way i know it will run when i go to work, lol

Artifex

In order to rule out maintenance issues, you need to run the car with a manual p13. You can convert an auto p13 to a manual one really easy if you know how (I think there is a link in the N/A library). Once you are running the car with the right ECU, then you can diagnose regular things like ignition and vacuum leaks.

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