idle surge, runs rich and cam noise

88notchback · November 3rd, 2009, 12:44 AM

i just got a 1988 notch back! this is what the guy that sold it to me said!
midly built 302 erson cam 512 lift, ported e7 heads, dual valve springs. electric fan. tubular k member with tubular a arms, coilovers on the front with 90/10 drag struts. the rear end is fully built and has the axel tubes welded. 31 spline axels 4:10 gear with a eaton posi. extended wheel studs also. drag springs in the rear with 50/50 drag shocks. also has bbk upper and lower control arms. trans is a fully built t-5(5 speed stick)with a brand new clutch installed on saturday, pro ripper short throw shifter, has an aluminum drive shaft. 8pt cromoly cage, mini starter, aluminum radiator. newer mickey thompson drag radials out back, skinny tires up front. interior is mostly stock except for the 8pt cage, the racing harnesses and the monster tach. has a 2 5/8 oil and fuel pressure gauge on the cowl. mallory ignition box and optima in the trunk! now my quistion are the cam seems to be make quite a bit of noise and when the car cold it has idle surges and runs really rich does any one know where i should start to figure out all my problems?

laztug · November 3rd, 2009, 12:51 AM

TPS/IAC sensor.
Disconnect them to see if the problem persists.

88notchback · November 3rd, 2009, 01:09 AM

it has a after market intake, intake manifold and throttle body but everything seem to be hooked up! i dont know if that makes a difference, but i am going to go out there and try that tomorrow

qwik48r · November 3rd, 2009, 01:35 AM

doesnt sound like a crazy motor... I agree with ^^

uhhh... dual springs are noisy.. especially when they are COLD, get used to that.. you say its running rich.. thats about a 1/4 of the story.. when is it running rich? that cam has some decent overlap, I expect it to run rich at idle on a stock computer... Erson does make a great cam, I currently run s .655" solid in a dart topped sbc bracket el dog... serious stick

surging is probably due to not enough timing in the lower RPMs, larger cams usually dont like to run a load at stoplight stop and go rpms...

if i was tuning this car, I would add more timing at idle, and dial back the fuel till its reading around 15.1-7 AFR at idle

88notchback · November 3rd, 2009, 01:50 AM

thanks i will do that tomorrow after work and will let you know!

93mustank · November 3rd, 2009, 02:03 AM

Originally Posted by qwik48r

uhhh... dual springs are noisy.. especially when they are COLD, get used to that..

You know those old squeaky springs.....

qwik48r · November 3rd, 2009, 02:41 AM

leave our relationship out of this...

call me.

88notchback · November 15th, 2009, 08:15 PM

i finaly got to pulling the check engine codes and i come up with
23, 31, 67, 81, 85, now my quiestion is where should i start and could any of these codes cause my idle surge problem? and another question i have is the owner told me these 19lbs injector are good up 450 hp and when i look on the internet it told me there on good up to 265hp what size injector do you think i should put it with the modds i have?

November 3rd, 2009, 12:44 AM	#1
88notchback Newbie Join Date: Nov 2009 Posts: 5	idle surge, runs rich and cam noise i just got a 1988 notch back! this is what the guy that sold it to me said! midly built 302 erson cam 512 lift, ported e7 heads, dual valve springs. electric fan. tubular k member with tubular a arms, coilovers on the front with 90/10 drag struts. the rear end is fully built and has the axel tubes welded. 31 spline axels 4:10 gear with a eaton posi. extended wheel studs also. drag springs in the rear with 50/50 drag shocks. also has bbk upper and lower control arms. trans is a fully built t-5(5 speed stick)with a brand new clutch installed on saturday, pro ripper short throw shifter, has an aluminum drive shaft. 8pt cromoly cage, mini starter, aluminum radiator. newer mickey thompson drag radials out back, skinny tires up front. interior is mostly stock except for the 8pt cage, the racing harnesses and the monster tach. has a 2 5/8 oil and fuel pressure gauge on the cowl. mallory ignition box and optima in the trunk! now my quistion are the cam seems to be make quite a bit of noise and when the car cold it has idle surges and runs really rich does any one know where i should start to figure out all my problems?

November 3rd, 2009, 12:51 AM	#2
laztug Regular 1993 Mustang GT Join Date: Jul 2008 Location: Big, Texas Posts: 176	TPS/IAC sensor. Disconnect them to see if the problem persists. __________________ Stock 5.0 Motor M/T Drag Radials E.T.- 13.859 MPH-97.23 60 foot-1.853

November 3rd, 2009, 01:35 AM	#4
qwik48r MM Fanatic 2002 SS incredibly slow Join Date: Jan 2008 Location: in the woods Posts: 3,621	doesnt sound like a crazy motor... I agree with ^^ uhhh... dual springs are noisy.. especially when they are COLD, get used to that.. you say its running rich.. thats about a 1/4 of the story.. when is it running rich? that cam has some decent overlap, I expect it to run rich at idle on a stock computer... Erson does make a great cam, I currently run s .655" solid in a dart topped sbc bracket el dog... serious stick surging is probably due to not enough timing in the lower RPMs, larger cams usually dont like to run a load at stoplight stop and go rpms... if i was tuning this car, I would add more timing at idle, and dial back the fuel till its reading around 15.1-7 AFR at idle __________________ turbocharged 2002 SS. 641rwhp @ 6700, pump gas. qwik's build

November 3rd, 2009, 02:41 AM	#7
qwik48r MM Fanatic 2002 SS incredibly slow Join Date: Jan 2008 Location: in the woods Posts: 3,621	leave our relationship out of this... call me. __________________ turbocharged 2002 SS. 641rwhp @ 6700, pump gas. qwik's build

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November 3rd, 2009, 01:09 AM	#3
88notchback Newbie Join Date: Nov 2009 Posts: 5	it has a after market intake, intake manifold and throttle body but everything seem to be hooked up! i dont know if that makes a difference, but i am going to go out there and try that tomorrow

November 3rd, 2009, 01:50 AM	#5
88notchback Newbie Join Date: Nov 2009 Posts: 5	thanks i will do that tomorrow after work and will let you know!

November 15th, 2009, 08:15 PM	#8
88notchback Newbie Join Date: Nov 2009 Posts: 5	i finaly got to pulling the check engine codes and i come up with 23, 31, 67, 81, 85, now my quiestion is where should i start and could any of these codes cause my idle surge problem? and another question i have is the owner told me these 19lbs injector are good up 450 hp and when i look on the internet it told me there on good up to 265hp what size injector do you think i should put it with the modds i have?

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