Question About Throttle Body

BiGD12590 · July 29th, 2006, 01:50 AM

I bought a new intake plenum and 75mm throttle body from 50resto.com and installed them yesterday. When i was done I took my car for a test drive and I could hear the difference, and when pulled out of my neighborhood I puched it and my car just cruised up to 50 mph. It was alot slower. So I called my friend's dad who is a mechanic and asked him what was the problem. He said that my cams are too small and I'm not creating enough back pressure. Is this true? If so what should I do? Thanks for your help.

I put the old throttle body back on but left the new intake plenum. It ran like it did before I put the 75mm throttle body on. I dont think the new intake plenum did anything performance wise, and if it did I cant tell.

flattusmaximus78 · July 29th, 2006, 07:51 AM

This worked for me.
Remove posative cable from battery.
Instal new intake plenum and 75mm throttle body according to directions.
Attach posative cable to battery.
Turn ignition to auxilary wait a minute.
Start car.

AtxStang · July 29th, 2006, 01:17 PM

I think your problem is your AF is too lean due to more air in the AF mixture. Retune your computer, i would bet if you drive it a little more your engine light will come on as well if you don't get it tuned.

I don't think it has anything to do with your cams.

mdvaldosta · July 29th, 2006, 01:55 PM

You don't need a tune. Reset the ecu as suggested and it will help alittle. A 75mm is too big for an N/A car anyways, you shoulda got a 70mm but nevertheless it's still more power over stock. It has nothing to do with backpressure or cams, and your car won't be slower for it.

White99stang · July 29th, 2006, 01:59 PM

that make sure you plugged all the vacuum lines back in.

AtxStang · July 29th, 2006, 02:06 PM

my bad i thought it was an AF problem, i stand corrected. To reset MIL do you turn ignition on, hit gas 3 times, then turn off? Thats what I heard you had to do.

mdvaldosta · July 29th, 2006, 02:27 PM

Never heard of that. Either use a tuner, pull the ECU fuse, or disconnect the battery. You can go through, I think, 3 drivecycles and it will reset itself also.

AtxStang · July 29th, 2006, 02:51 PM

Yea my light has been on since about 3 days after I put plenum, TB and CAI. I thought it was running lean and I needed a tune but after reading this thread I just went to check all vacuum lines and I found my CAI came unhooked from my TB and it was sucking straight air into engine. Very bad I hope I didn't damage anything.

- also when I put the x-pipe on the MIL eliminators they sent me were the same, I thought there were left and right connections though

Screemin3o2 · July 29th, 2006, 09:06 PM

BigD:
Are you getting an MIL? Make sure you have all of your connectors to your sensors plugged in. A connector can appear to be plugged in when it really isn't if you don't look at it close enough. And check all sources of vacuum for leaks. You do not need a retune because the incoming air through the throttle plate is metered air. Your cams have nothing to do with your problem.

Atx:
You would have to have terrible luck for that to damage anything if dirt or anything bad were to get past the throttle plate enough to cause any damage. You worst case scenario is that it ran like shit for a few days. It depends on what you had unhooked exactly, but it was most likely running like that because your MAF sensor was not sending the correct voltage to your PCM based on the air it was reading.

AtxStang · July 30th, 2006, 12:02 AM

It is running good now, the light is still on but that might be because of the o2 sensors - I put the MIL eliminators on but they are different looking connectors I had to cut some tabs on the left connector to get it to fit.

BiGD12590 · July 30th, 2006, 12:33 AM

Thanx for everyones help. The throttle body sensor was not plugged in all the way. So when I plugged that in I took it for a drive and I could really tell the difference, better throttle response and faster accleration , but now I have a different problem. Its shifting at higer RPM's ( i dont know if thats normal for an aftermarket throttle body), and it wont shift into 3rd or 4th gear. My car is an automatic and I tried shifting manualy, but it wont shift out of second. Im gonna try and see if I can find out what the problem is, but if anyone has any ideas of whats wrong I would gladly appreciate it.
Thanx

BiGD12590 · July 30th, 2006, 12:33 PM

I fixed the problem today. There was a spacer that was in between the throttle body and the throttle body sensor. So when i screwed in the throttle body sensor it bowed in the middle cuz of the spacer, so I took off the spacer and screwed the throttle body sensor back in. After that it was fine and shifted smoothly like it did before. But the check engine light is on and has been on ever since i put the new throttle body on. I didnt know if it was normal,if it will go away after a couple days, or if i should get it tuned. But I dont know.

AtxStang · July 30th, 2006, 01:28 PM

I think you have to reset it somehow, but mdvaldosta explains it further up in this post - check it out. He said it will reset after 3 drive cycles also i think.

Twist 2 Go · July 30th, 2006, 03:05 PM

just disconnect the battery cable for about 5mins. that will reset it. If it comes back on, you have a problem somewhere. Then it's time to get the dtc retreived so we can help you.

BiGD12590 · July 30th, 2006, 10:47 PM

Alright. Thanx for all your help.

July 29th, 2006, 01:50 AM	#1
BiGD12590 Regular Join Date: Jul 2006 Location: Estero, Florida Posts: 72	Question About Throttle Body I bought a new intake plenum and 75mm throttle body from 50resto.com and installed them yesterday. When i was done I took my car for a test drive and I could hear the difference, and when pulled out of my neighborhood I puched it and my car just cruised up to 50 mph. It was alot slower. So I called my friend's dad who is a mechanic and asked him what was the problem. He said that my cams are too small and I'm not creating enough back pressure. Is this true? If so what should I do? Thanks for your help. I put the old throttle body back on but left the new intake plenum. It ran like it did before I put the 75mm throttle body on. I dont think the new intake plenum did anything performance wise, and if it did I cant tell.

July 29th, 2006, 07:51 AM	#2
flattusmaximus78 MM Fanatic 1993 5.ohhhh 14.47 at 96 mph Join Date: Apr 2006 Location: Gatorland Posts: 3,066	This worked for me. Remove posative cable from battery. Instal new intake plenum and 75mm throttle body according to directions. Attach posative cable to battery. Turn ignition to auxilary wait a minute. Start car. __________________ 302 h/c/i

July 29th, 2006, 01:59 PM	#5
White99stang MM's nicest mod, :) Join Date: Aug 2005 Location: elkridge, MD Posts: 2,851	that make sure you plugged all the vacuum lines back in. __________________ Have a Nice Day, Especially MSO 99 Mustang GT VT 302 Stroker 11.13@123 f.s. 9k 06 Dodge MegaCab Diesel 455rwhp/815rwtq

July 29th, 2006, 09:06 PM	#9
Screemin3o2 Enthusiast Join Date: Jun 2006 Location: Knoxville, TN Posts: 616	BigD: Are you getting an MIL? Make sure you have all of your connectors to your sensors plugged in. A connector can appear to be plugged in when it really isn't if you don't look at it close enough. And check all sources of vacuum for leaks. You do not need a retune because the incoming air through the throttle plate is metered air. Your cams have nothing to do with your problem. Atx: You would have to have terrible luck for that to damage anything if dirt or anything bad were to get past the throttle plate enough to cause any damage. You worst case scenario is that it ran like shit for a few days. It depends on what you had unhooked exactly, but it was most likely running like that because your MAF sensor was not sending the correct voltage to your PCM based on the air it was reading. __________________ 95 Mustang GT Slow Bolt On Car http://img61.imageshack.us/img61/8386/sig4rx2.jpg www.steelcitystangs.com

July 30th, 2006, 03:05 PM	#14
Twist 2 Go Hardcore Enthusiast Join Date: Aug 2005 Location: Chesapeake, Virginia Posts: 1,716	just disconnect the battery cable for about 5mins. that will reset it. If it comes back on, you have a problem somewhere. Then it's time to get the dtc retreived so we can help you. __________________ 88 Mustang Coupe 2006 FFW Richmond True Street Runner-Up www.rickscarcare.net http://img146.imageshack.us/img146/2158/ricksadql2.jpg

Sponsored Links	Remove Advertisements
Forums at Modded Mustangs Advertisement

July 29th, 2006, 01:17 PM	#3
AtxStang Regular Join Date: Jul 2006 Posts: 116	I think your problem is your AF is too lean due to more air in the AF mixture. Retune your computer, i would bet if you drive it a little more your engine light will come on as well if you don't get it tuned. I don't think it has anything to do with your cams.

July 29th, 2006, 01:55 PM	#4
mdvaldosta Maintenance Man 2002 Mustang GT 11.47@120.58 Join Date: Aug 2005 Location: Valdosta, GA Posts: 3,943	You don't need a tune. Reset the ecu as suggested and it will help alittle. A 75mm is too big for an N/A car anyways, you shoulda got a 70mm but nevertheless it's still more power over stock. It has nothing to do with backpressure or cams, and your car won't be slower for it.

July 29th, 2006, 02:06 PM	#6
AtxStang Regular Join Date: Jul 2006 Posts: 116	my bad i thought it was an AF problem, i stand corrected. To reset MIL do you turn ignition on, hit gas 3 times, then turn off? Thats what I heard you had to do.

July 29th, 2006, 02:27 PM	#7
mdvaldosta Maintenance Man 2002 Mustang GT 11.47@120.58 Join Date: Aug 2005 Location: Valdosta, GA Posts: 3,943	Never heard of that. Either use a tuner, pull the ECU fuse, or disconnect the battery. You can go through, I think, 3 drivecycles and it will reset itself also.

July 29th, 2006, 02:51 PM	#8
AtxStang Regular Join Date: Jul 2006 Posts: 116	Yea my light has been on since about 3 days after I put plenum, TB and CAI. I thought it was running lean and I needed a tune but after reading this thread I just went to check all vacuum lines and I found my CAI came unhooked from my TB and it was sucking straight air into engine. Very bad I hope I didn't damage anything. - also when I put the x-pipe on the MIL eliminators they sent me were the same, I thought there were left and right connections though

July 30th, 2006, 12:02 AM	#10
AtxStang Regular Join Date: Jul 2006 Posts: 116	It is running good now, the light is still on but that might be because of the o2 sensors - I put the MIL eliminators on but they are different looking connectors I had to cut some tabs on the left connector to get it to fit.

July 30th, 2006, 12:33 AM	#11
BiGD12590 Regular Join Date: Jul 2006 Location: Estero, Florida Posts: 72	Thanx for everyones help. The throttle body sensor was not plugged in all the way. So when I plugged that in I took it for a drive and I could really tell the difference, better throttle response and faster accleration , but now I have a different problem. Its shifting at higer RPM's ( i dont know if thats normal for an aftermarket throttle body), and it wont shift into 3rd or 4th gear. My car is an automatic and I tried shifting manualy, but it wont shift out of second. Im gonna try and see if I can find out what the problem is, but if anyone has any ideas of whats wrong I would gladly appreciate it. Thanx

July 30th, 2006, 12:33 PM	#12
BiGD12590 Regular Join Date: Jul 2006 Location: Estero, Florida Posts: 72	I fixed the problem today. There was a spacer that was in between the throttle body and the throttle body sensor. So when i screwed in the throttle body sensor it bowed in the middle cuz of the spacer, so I took off the spacer and screwed the throttle body sensor back in. After that it was fine and shifted smoothly like it did before. But the check engine light is on and has been on ever since i put the new throttle body on. I didnt know if it was normal,if it will go away after a couple days, or if i should get it tuned. But I dont know.

July 30th, 2006, 01:28 PM	#13
AtxStang Regular Join Date: Jul 2006 Posts: 116	I think you have to reset it somehow, but mdvaldosta explains it further up in this post - check it out. He said it will reset after 3 drive cycles also i think.

Threads Similar to: Question About Throttle Body
Thread	Thread Starter	Forum	Replies	Last Post
Throttle Body Question	95blackbeauty	94-95	2	September 17th, 2007 11:55 PM
New Throttle Body question	neckbonekat	99-04	3	July 15th, 2007 10:42 PM
Throttle Body Question	sbland26	V6 Mustangs	44	May 20th, 2007 04:26 AM
throttle body question	RyanGT	99-04	32	January 8th, 2007 11:05 PM
Throttle Body Spacer Question	cobraetti	5.0 Mustangs	15	November 1st, 2006 05:32 PM

All times are GMT -4. The time now is 07:19 PM.
Contact Us - Modded Mustangs - Top
Modded Mustangs is ©2005-2008, All Rights Reserved, And is Not Affiliated with Ford Motor Company. Forum is powered by vBulletin ©2000 - 2008, Jelsoft Ent. Ltd. & SEO by vBSEO 3.1.0 ©2007, Crawlability, Inc.

July 30th, 2006, 10:47 PM	#15
BiGD12590 Regular Join Date: Jul 2006 Location: Estero, Florida Posts: 72	Alright. Thanx for all your help.