Antifreeze leaking up through intake manifold screw - TCCoA Forums
 
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post #1 of 11 (permalink) Old 09-30-2013, 03:25 PM Thread Starter
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Antifreeze leaking up through intake manifold screw

I've had this intake manifold off before because of the same issue in the past. Issue went away for a short time and now is back...coolant is coming up through the rearmost bolt on the intake manifold.

When I had it out before, the manifold did not appear cracked, but maybe something is warped back there?!?! Never overheated- last time I let it sit until I had time to fix it...could it have corroded?!?!?

What kills me is that the bolt was the ONE bolt I couldn't torque down the same way the others could be...it sits under the sill and I had to just feel it according to what the other properly torques bolts felt like...

Any suggestions?

I think I am sucking antifreeze down the intake when I accelerate hard because it knocks and pings under heavy accel...

Dave
97 4.6 Auto cat
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post #2 of 11 (permalink) Old 09-30-2013, 04:14 PM
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Did you replace the intake to head gaskets when you had it off last time? Are you sure it's not leaking from the heater hose connection?

Knocking under load is probably your MAF sensor being dirty...

-Brandon
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post #3 of 11 (permalink) Old 09-30-2013, 07:58 PM Thread Starter
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Yes, I bought new gaskets...didn't use sealer, but it didn't look like it had any to begi with. I could tell where it had breached the previous gasket, so I thought my problem would be solved.

I looked for cracks on the intake but didn't see any... I thought they mainly cracked around the thermostat housing... Back to the drawing board...

I have some maf sensor cleaner that I will use and report back.
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post #4 of 11 (permalink) Old 09-30-2013, 11:12 PM
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Stock tune on 87 in hot weather will ping a little on the 96-97's at low RPM, high load and up top too.

Michael M. ASE P2 Automobile Parts Specialist.

1996 Thunderbird LX. Gone, but not forgotten Oct 1995-March 24 2016 Trick Flow headded, E85 guzzling beast.

1985 Mustang GT. modified stock Holley 4180C, Weiand Street Warrior intake manifold, equal length headers, true dual exhaust, 5 speed, 3.55:1 8.8'' rear end, Ford Racing 10.5" clutch.

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post #5 of 11 (permalink) Old 10-01-2013, 05:33 AM
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Quote:
Originally Posted by Mgino96tbird46 View Post
Stock tune on 87 in hot weather will ping a little on the 96-97's at low RPM, high load and up top too.
It shouldn't. Mine never did after a proper tune up.

-Brandon
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post #6 of 11 (permalink) Old 10-01-2013, 09:03 AM
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Mine did for some reason. Stock configuration with somewhat neutral fuel trims and a clean MAF.

Michael M. ASE P2 Automobile Parts Specialist.

1996 Thunderbird LX. Gone, but not forgotten Oct 1995-March 24 2016 Trick Flow headded, E85 guzzling beast.

1985 Mustang GT. modified stock Holley 4180C, Weiand Street Warrior intake manifold, equal length headers, true dual exhaust, 5 speed, 3.55:1 8.8'' rear end, Ford Racing 10.5" clutch.

1998 Mustang GT premium. Trans Go shift kit, Bassani catted x-pipe, PI heads, cams, intake swap, Accufab elbow, SCT Xcal 4 tune, Eibach Pro-kit, Maximum Motorsports Caster/camber plates, fat tires. Banging audio system.
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post #7 of 11 (permalink) Old 10-01-2013, 01:12 PM
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Quote:
Originally Posted by fjazzbass View Post
Yes, I bought new gaskets...didn't use sealer, but it didn't look like it had any to begi with. I could tell where it had breached the previous gasket, so I thought my problem would be solved.

I looked for cracks on the intake but didn't see any... I thought they mainly cracked around the thermostat housing... Back to the drawing board...

I have some maf sensor cleaner that I will use and report back.
What brand of replacement gaskets did you use? Is it the OEM intake? How long since the most recent cooling system flush?

-Brandon
97 Laser Red Thunderbird LX 162k, Stage 2 4.6L 2v N/A | 300 BHP (255 RWHP, 290 RWTQ) | 13.95 @ 97.58 | Build details | Pics at the Lorain Assembly plant
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07 Redfire Fusion V6 SEL 178k, for the wife
Gone but not forgotten: 96 Mark VIII, 94 Cougar XR7, 93 Mark VIII

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post #8 of 11 (permalink) Old 10-01-2013, 08:13 PM Thread Starter
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I just bought whatever the auto parts store had....probably a mistake :-(

I also haven't done a flush and fill in a while...I'll do both when I re do the repair...do I need the oem gasket? Also, it is the second intake manifold...from what I remember...it was my dad's car originally and I think he had to have it replaced before I got it.

Dave
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post #9 of 11 (permalink) Old 10-01-2013, 09:01 PM
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Use OEM gaskets this time around, then flush out the system. If the intake has the aluminum crossover and doesn't have the gaskets molded into it, then it's an OEM replacement (the originals had plastic crossovers that would crack). And obviously make sure you clean both the head surface and intake surface well before reassembly.

-Brandon
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post #10 of 11 (permalink) Old 11-01-2013, 08:22 PM Thread Starter
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got intake off, its ugly

Finally took the time to take this thing apart. I don't know what happened- I torqued the bolts on this thing to spec but it looks like it leaked coolant all over the place...I will definitely do a flush after replacing this one. I just cannot believe that I paid for those garbage gaskets from Felpro!!!

I sure hope I didn't damage the engine by allowing coolant to leak down into the engine...

I'm pretty frustrated...
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post #11 of 11 (permalink) Old 11-02-2013, 04:49 PM Thread Starter
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Crack!

After RE-examining the old intake I have found the leak...not sure if it were there before or not, but I am so glad I found the cause of this mess...

Thanks for all the help!!!

Dave
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