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Missing and Popping

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Missing and Popping Empty Missing and Popping

Post by 95GTS Tue Jul 15, 2008 11:31 am

Had a new engine put in the 95 Stang. Installed shorty headers, pulleys, typhoon intake and 70mm TB. Car idles okay. When you drive it, it shakes, and backfires through the intake at low speeds. I have to rev the engine pretty good to get it off line. Other than timing, what can I check? Could bad EGR cause this?
95GTS
95GTS
Small Block 302
Small Block 302

Male Number of posts : 356
Age : 60
Humor : Sometimes you're the windshield, Sometimes you're the bug...
My Ride/Rides: : 1995 GTS
Mods: : Basically stock

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Missing and Popping Empty Re: Missing and Popping

Post by Guest Tue Jul 15, 2008 11:33 am

a bad EGR will also cause an extremely rough idle... almost as if it were cammed... Are the 95's MAF? If so... make sure the IAC is all clean and connected properly..

Guest
Guest


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Missing and Popping Empty Re: Missing and Popping

Post by 95GTS Tue Jul 15, 2008 12:53 pm

Yes, they are MAF'd. EGR is about $80. Guess I can have it checked.
95GTS
95GTS
Small Block 302
Small Block 302

Male Number of posts : 356
Age : 60
Humor : Sometimes you're the windshield, Sometimes you're the bug...
My Ride/Rides: : 1995 GTS
Mods: : Basically stock

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Missing and Popping Empty Re: Missing and Popping

Post by Guest Tue Jul 15, 2008 1:50 pm

IACV will do it more than an EGR, EGR's only will cause this usally at cruising speeds. At idle they don't usually pump gas's in.

Guest
Guest


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Missing and Popping Empty Re: Missing and Popping

Post by 1fstroush Tue Jul 15, 2008 3:05 pm

Check the following...

1) MAP or MAF: Connections going to and from the sensor. Clean it with some electrical cleaner or MAF cleaner

2) IAT: This sensor tells the motor what temp the air is entering the motor. If this sensor is dirty or not working it could cause the car to hesitate

3) IAC: This controls the idle of the car. Check the vacuum lines and electrical connections. Clean the unit with electrical cleaner. If needed due to oil build up, clean with carb cleaner.

4) Vacuum lines: Check for dry rotting, cracking, loose, or just plain missing lines.

AJ
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Missing and Popping Empty Re: Missing and Popping

Post by 95GTS Wed Jul 16, 2008 11:37 am

1fstroush wrote:Check the following...

1) MAP or MAF: Connections going to and from the sensor. Clean it with some electrical cleaner or MAF cleaner

2) IAT: This sensor tells the motor what temp the air is entering the motor. If this sensor is dirty or not working it could cause the car to hesitate

3) IAC: This controls the idle of the car. Check the vacuum lines and electrical connections. Clean the unit with electrical cleaner. If needed due to oil build up, clean with carb cleaner.

4) Vacuum lines: Check for dry rotting, cracking, loose, or just plain missing lines.

AJ

Thanks All!!!

I checked and cleaned the MAF, seems to be good. Checked all vacuum lines, sprayed with starting fluid to pickup leaks, all seem good.

Found leak in EGR tube at header connection. I want to remove the EGR all together but have read conflicting information across Mustang Forums. Any thoughts on EGR delete?

Car cranks and idles great. Backfiring occurs when taking off and at low speeds. Above about 30 or so I don't notice a backfire but car feels sluggish.
95GTS
95GTS
Small Block 302
Small Block 302

Male Number of posts : 356
Age : 60
Humor : Sometimes you're the windshield, Sometimes you're the bug...
My Ride/Rides: : 1995 GTS
Mods: : Basically stock

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Missing and Popping Empty Re: Missing and Popping

Post by Guest Wed Jul 16, 2008 11:42 am

plugs? wires coils?

Guest
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Missing and Popping Empty Re: Missing and Popping

Post by 1fstroush Thu Jul 17, 2008 9:53 am

As Stevi said...Plugs, wires, coils, distributor, etc...
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Missing and Popping Empty Re: Missing and Popping

Post by 95GTS Thu Jul 17, 2008 9:57 am

SteviGX wrote:plugs? wires coils?

Plugs and Coil is new. Will check wires but seems odd that they would only malfunction at low speeds and not affect idle or high speeds. Appreciate the feedback. It's gotta be something simple making it do it... :*bonk(:
95GTS
95GTS
Small Block 302
Small Block 302

Male Number of posts : 356
Age : 60
Humor : Sometimes you're the windshield, Sometimes you're the bug...
My Ride/Rides: : 1995 GTS
Mods: : Basically stock

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Missing and Popping Empty Re: Missing and Popping

Post by 1fstroush Thu Jul 17, 2008 10:00 am

95GTS wrote:
SteviGX wrote:plugs? wires coils?

Plugs and Coil is new. Will check wires but seems odd that they would only malfunction at low speeds and not affect idle or high speeds. Appreciate the feedback. It's gotta be something simple making it do it... :*bonk(:
3

Pull the new plugs and wires, make sure that your gaps are correct. Even the slightest gap issue will give these cars problems.

AJ
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Missing and Popping Empty Re: Missing and Popping

Post by 95GTS Thu Jul 17, 2008 10:02 am

Will do, thanks AJ. I'll let you know how it turns out.
95GTS
95GTS
Small Block 302
Small Block 302

Male Number of posts : 356
Age : 60
Humor : Sometimes you're the windshield, Sometimes you're the bug...
My Ride/Rides: : 1995 GTS
Mods: : Basically stock

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Missing and Popping Empty Re: Missing and Popping

Post by Guest Thu Jul 17, 2008 7:32 pm

If it's sluggish at idle and low rpm's and speeds under 20mph, then it's the IAC.. Unforunately they go without any warning, especially on the earlier SN95 models.... Particularly if you've already checked vacumn lines and MAF for problems.

Guest
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Missing and Popping Empty Re: Missing and Popping

Post by 95GTS Fri Jul 18, 2008 8:55 am

Checked plug wires and plugs...all good. I'm pulling the IAC this weekend to check it.
95GTS
95GTS
Small Block 302
Small Block 302

Male Number of posts : 356
Age : 60
Humor : Sometimes you're the windshield, Sometimes you're the bug...
My Ride/Rides: : 1995 GTS
Mods: : Basically stock

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Missing and Popping Empty Re: Missing and Popping

Post by 95GTS Sat Jul 19, 2008 4:27 pm

Well, you were right...it was the IAC. I took it off and cleaned it, took it for a test run and no more problems. I still need to either remove the EGR assembly or get an EGR pipe fabricated to fit. I have it patched right now with still a little leak...

Thanks to all!
95GTS
95GTS
Small Block 302
Small Block 302

Male Number of posts : 356
Age : 60
Humor : Sometimes you're the windshield, Sometimes you're the bug...
My Ride/Rides: : 1995 GTS
Mods: : Basically stock

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Missing and Popping Empty Re: Missing and Popping

Post by Guest Sat Jul 19, 2008 4:59 pm

95GTS wrote:I still need to either remove the EGR assembly or get an EGR pipe fabricated to fit. I have it patched right now with still a little leak...
get with Bill Fisher, he's great at this kind of stuff...

Guest
Guest


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Missing and Popping Empty Re: Missing and Popping

Post by 95GTS Mon Jul 21, 2008 8:54 am

Will do...
95GTS
95GTS
Small Block 302
Small Block 302

Male Number of posts : 356
Age : 60
Humor : Sometimes you're the windshield, Sometimes you're the bug...
My Ride/Rides: : 1995 GTS
Mods: : Basically stock

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Missing and Popping Empty Re: Missing and Popping

Post by FRCE_FED Tue Jul 22, 2008 1:34 am

I took out my EGR on my 2000 v6 and have had no trouble after turning the EGR off on the computer Smile
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Mods: : Built 3.8l, Custom little 62mm Single Turbo, fox 8.8 rear, TKO500 5speed manual trans, HPX 05 maf, custom tune by myself, and vmp tuning Looking for 550rwh at the wheels! Its just a lil v6 Smile

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Missing and Popping Empty Re: Missing and Popping

Post by 95GTS Tue Jul 22, 2008 12:47 pm

Murph wrote:I took out my EGR on my 2000 v6 and have had no trouble after turning the EGR off on the computer Smile

I'm working on it...I removed the EGR and pipe, capped the EGR hole, capped the header hole, and bought an EGR replicator to connect to the electrical. All I need to do now is cap the vacuum lines and fire it up. Am I missing anything?
95GTS
95GTS
Small Block 302
Small Block 302

Male Number of posts : 356
Age : 60
Humor : Sometimes you're the windshield, Sometimes you're the bug...
My Ride/Rides: : 1995 GTS
Mods: : Basically stock

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