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post #1 of 39 (permalink) Old 11-03-2005, 10:24 PM Thread Starter
 
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Exclamation Weird Problem With the 3.8

My 3.8 Essex in my Thunderbird is making a whooping/mooing sound coming from the upper intake manifold when shutting off, and you can feel each combustion chamber hit one last time. Any ideas on what this could be?
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post #2 of 39 (permalink) Old 11-03-2005, 11:36 PM
 
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Have you checked for vacuum leaks?
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post #3 of 39 (permalink) Old 11-04-2005, 12:39 PM
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yeah, i would check your vacuum lines first.
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post #4 of 39 (permalink) Old 11-04-2005, 02:27 PM Thread Starter
 
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I've checked and found none leaking, but its hard to hear for a leak seeing as my ps pump is going out so it whines, but i checked and couldn't find one.
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post #5 of 39 (permalink) Old 11-04-2005, 02:32 PM
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whens the last time you changed your airfilter or cleaned your MAF?
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post #6 of 39 (permalink) Old 11-04-2005, 02:34 PM
 
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Try spraying soapy water, or use an unlit propane torch around the vacuum lines and manifold. You can see the leak (if there are any) with the soap and water, or when you hit one with the propane you will hear it when the engine sucks it in. Also check around the throttle body.
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post #7 of 39 (permalink) Old 11-04-2005, 08:16 PM Thread Starter
 
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I just recently took the MAF off and cleaned it(last week cause I thought that was the problem.) And the airfilter is still clean but its a fram so im looking into a k&n airfilter. And tommorrow i'll try the soapy water thing.
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post #8 of 39 (permalink) Old 11-05-2005, 08:00 AM
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the k&n is not going to help you... the only advantage you will have is being a reusable filter. our engines do not suck in enough air.

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post #9 of 39 (permalink) Old 11-05-2005, 10:45 AM
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word to that
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post #10 of 39 (permalink) Old 11-05-2005, 02:22 PM Thread Starter
 
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I've had plenty of experience with cars that don't suck in air, such as a ford taurus. and trust me a k&n is much more worth it than this fram paper filter.
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post #11 of 39 (permalink) Old 11-05-2005, 02:34 PM
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okay, you got me... I don't know what I'm talkin about

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post #12 of 39 (permalink) Old 11-05-2005, 05:16 PM Thread Starter
 
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im not saying your wrong but i prefer the k&n compared to whats in there. compared to what feels like 5 layers of contruction paper stuck in my intake i'll take just about anything else
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post #13 of 39 (permalink) Old 11-10-2005, 02:37 PM Thread Starter
 
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so i figured out my engine light isn't lighting up cause this has to be throwing codes, im trying to get the dash off but the light nob refuses to come off, is there any tricks to get that little lever release to let go.
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post #14 of 39 (permalink) Old 11-10-2005, 03:12 PM Thread Starter
 
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I got it I just had to pull harder. And there was no bulb in the socket. So I put one in, so now if it doesn't light up the computer doesn't know anything right? or do I have to do something to kick the computer into gear?
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post #15 of 39 (permalink) Old 11-10-2005, 03:14 PM
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That sound that you're hearing from the upper intake when turning off is a common precursor to the failure of the IAC (idle air control). If your car suddenly starts experiencing a high idle, you'll know that the IAC's done.

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post #16 of 39 (permalink) Old 11-10-2005, 03:24 PM Thread Starter
 
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well thats good to know because i idle at over 2000rpms, will that throw a code?
and is there another name, i can't find it on the autozone site
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post #17 of 39 (permalink) Old 11-10-2005, 04:42 PM
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Quote:
Originally Posted by racecougar
That sound that you're hearing from the upper intake when turning off is a common precursor to the failure of the IAC (idle air control). If your car suddenly starts experiencing a high idle, you'll know that the IAC's done.

-Rod
i would start there as well .

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post #18 of 39 (permalink) Old 11-10-2005, 05:07 PM
 
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The IAC may not throw a code. Mine never did when it died. I also had the same problem with getting a new one, the guy at the store knew what I wanted but couldnt find it on the system. Youll prob have to go to a dealer, or get a used one from a wrecker.
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post #19 of 39 (permalink) Old 11-10-2005, 05:34 PM
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dont botherwith a used one, not worth the time and effort

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post #20 of 39 (permalink) Old 11-10-2005, 06:04 PM
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ford calls the IAC the Air Bypass Valve
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post #21 of 39 (permalink) Old 11-10-2005, 10:41 PM Thread Starter
 
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well the light came on but i don't know how to get it to show me the codes, its simly just glowing.
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post #22 of 39 (permalink) Old 11-10-2005, 11:49 PM
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Quote:
Originally Posted by sage88
well the light came on but i don't know how to get it to show me the codes, its simly just glowing.
You'll need a EEC-IV code reader. IIRC, those are only about $40 at your local auto parts store. Or, you could just take the car to Autozone to have the codes read for free.

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post #23 of 39 (permalink) Old 11-11-2005, 02:22 PM Thread Starter
 
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Codes have been read and now I'm confused, cause I don't know what to do.
Codes: 337 and 157
337 maximum voltage at EGR Valve
157 minimum voltage at MAF
if i remember correctly those are the only ones, any ideas what they mean
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post #24 of 39 (permalink) Old 11-11-2005, 02:32 PM
 
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157 Manifold Air Flow sensor fault, low voltage

337 EGR sensor circuit above maximum voltage

By the codes, there is a problem with the MAF sensor, and the EGR valve
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post #25 of 39 (permalink) Old 11-11-2005, 03:11 PM Thread Starter
 
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the maf is clean not scuffed or clogged or anything and properly connected, and the EGR sensor I don't know much about those but I'll go check and see if theres anything visibly wrong with the maf, anything else that could help me narrow it down and whether or not i can fix it
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post #26 of 39 (permalink) Old 11-12-2005, 08:26 AM
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The MAF may be clean but not functioning. If you know someone who has a spare MAF or just a worikng one you can swap on for a bit. Try that.

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post #27 of 39 (permalink) Old 11-14-2005, 02:20 PM Thread Starter
 
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Yeah my autotech teacher told me that the maf is going out, so if I get a new one I want a bigger one, what all would I need to make it fit in the tbird, let me find the one I want........its on the supercoupeperformance.com site its the c&l 76mm maf. I wanted to know if thats good or what do you guys suggest?
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post #28 of 39 (permalink) Old 11-14-2005, 02:23 PM Thread Starter
 
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or should i get a 90mm lightning or big air maf off of americanmotorsport.com
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post #29 of 39 (permalink) Old 11-14-2005, 03:07 PM
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I'd just replace it with a 70mm MAF from a 94+ MN12. It would be a direct plug and play, and would definitely provide enough flow for your 3.8L.

-Rod

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94 LX w/Splitport 3.8L from 2000 Mustang - SOLD
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post #30 of 39 (permalink) Old 11-14-2005, 04:42 PM
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do you have to reprogram for a 70mm? if not im gonna upgrade to that and a mustang intake tube i think should work. right?
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