Idle problem 98 civic with a b20motor please help
10-13-2018, 03:00 PM
#1
Honda-Tech Member
Thread Starter
Idle problem 98 civic with a b20motor please help
I have a 98 civic with a b20 motor and a skunk two mani with a matching 70mm tb I was using a stock p28 and the car was running good but was choking at low rpm so got a p72 chip out for my motor and the car doesn’t choking anymore and run perfect but issue I’m having is with the p28 my idle was perfect now with the p72 ecu my idle high at start up and etc doesn’t go low at all I adjusted the tb screw all the way in and still didn’t change my idle what can it be I was looking at the tb sensor in the back the Throttle Position Sensor can it be that and what should it do when the car on and I unplug it please help
10-13-2018, 05:17 PM
#3
Honda-Tech Member
Thread Starter
Re: Idle problem 98 civic with a b20motor please help
And another issue at first when I got the car back from the shop and motor down car turn on quick and fast and been having a issue with it taking a few turn with the key to start something I have to turn the car a few times and turn it off and hit the gas to be Able to turn the car on sound like there not enough gas when I try it the next day after the car get warm and I try to start it again it start good but if I let the car sit for a hours then hard to get it on what can it be
10-13-2018, 08:24 PM
#4
Honda-Tech Member
Re: Idle problem 98 civic with a b20motor please help
Stop trying random chips and ECU's and get the car tuned. The problem is likely the 70mm T/B that you have bolted to your B20... you need that about as much as you need another hole in your backside. It will NOT improve the performance of the engine at all, and in fact create idle and midrange issues... likely losing power from 1500 to 4500 rpm. The TPS needs to be set. Put your stock T/B back on and see if the problem goes away.
10-14-2018, 12:35 PM
#5
Honda-Tech Member
Thread Starter
Re: Idle problem 98 civic with a b20motor please help
Don’t have stock part anymore and and ain’t trying diff ecu got the stock p28 that the car rans good but got a p72 chip out for my motor at r tune places and car runs a lot better with the chip ecu but with the p28 idea. Good and now the idea kinda high with the p72 why
10-14-2018, 12:57 PM
#6
Re: Idle problem 98 civic with a b20motor please help
You must set up the TPS with a voltmeter after changing throttle body etc.
Warm up the engine then unplug the IACV-- that should starve the engine for air and make it idle very slowly. If it does not slow down you need to find out how the extra air is getting in.
Warm up the engine then unplug the IACV-- that should starve the engine for air and make it idle very slowly. If it does not slow down you need to find out how the extra air is getting in.
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10-14-2018, 08:49 PM
#9
Honda-Tech Member
Re: Idle problem 98 civic with a b20motor please help
Because you don't know what "tune" is on the chip in the P72... only what you have been told. Getting the car tuned by a reputable tuner will likely solve your issue.
10-15-2018, 03:47 PM
#10
Honda-Tech Member
Thread Starter
Re: Idle problem 98 civic with a b20motor please help
The chip and ecu was done at a tune shop and he ask me all the stuff and seen what stuff I had on the motor so was ecu and the chip was done at a tune shop
10-15-2018, 08:57 PM
#11
Honda-Tech Member
Re: Idle problem 98 civic with a b20motor please help
Well, since a tuning shop made the basemap, it must be good. Maybe you should ask them what they think is your problem.
10-16-2018, 05:37 PM
#12
Honda-Tech Member
Thread Starter
Re: Idle problem 98 civic with a b20motor please help
Don’t know if they rite but they kinda 3 Hours from em to take a trip but they told me they disabled the 02 sensor and knock sensor and unneeded sensor and they sayinf my checking light shouldn’t be on so they saying ifs some sensor in my motor is making it idle high but how is the car idle good with a stock p28 and a stock p72 but not with the chip out ecu I got from them car idle high and vibration a lot but run perfect and two step work and etc
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