popping coming from intake manifold - The Ford Focus Forum

**zbigity** · 11-03-2009, 06:57 PM

I have an 02 svt. when a idle I can hear popping coming from the intake manifold. could that be a fuel injector leecking? i also did a compression check #1-90 then 120 with oil #2 100 then 135 oil #3 105 then 145 oil #4 100 then 150 oil for compression. i know that is low for compression but i don't think that has anything to do with it. it was a junk yard motor with 90000 mi on it. the coolant temp sensor was bad and running rich I think that is why the compression is low and why the plug were almost melted away. i guess that is what you get for 500$
The plugs and coil have less then 5000 miles on them.every now and then the mil light comes on and there are 2 codes for the front o2 sensors i forget the code #.
Also some times when i am accelerating right around 4800 and 5000 rpm it will loose power then after 5000 it is fine. I does not do it all the time either.

**zbigity** · 11-03-2009, 08:59 PM

well ring are bad. how much can the stock svt block be bored over. and where can i get over sized pistons?

**Nik33615** · 11-04-2009, 04:32 AM

lol the title reminded me of the POP from my intake manifold when I cleaned the throttle body with carb cleaner....Started the car and POP! blew the intake manifold off the part that bolts to the head...don't do that kids...back to topic..

**cfmfocus2** · 11-04-2009, 05:33 PM

Quote:

Originally Posted by zbigity

well ring are bad. how much can the stock svt block be bored over. and where can i get over sized pistons?

The compression ratio on the factory svt focus is 10.2 compression.

We offer pistons in .007 overbore and .027 overbore. .027 is the about the most I would recommend.

Ford does not offer a factory overbore replacement, so a custom set would need to be made.

We can have a custom set of CP Pistons made in stock compression or any compression you want. http://focus.c-f-m.com/newitemcppist...uszetec20.aspx.

No piston manufacturer makes a piston set that is compatable to the factory SVT Rod, so you would need to purchase a set of zetec rods like the eagle h-beam rods http://focus.c-f-m.com/eagleforgeh-b...csvtst170.aspx.

**COSVT03** · 11-06-2009, 05:09 PM

Ford offers 3 sets of pistons for that motor. Depending on tooling date of the engine, could have the smaller pistons. But getting replacements may be hard. But anyways. If your going to do the work, might as well put a nicer set of pistons in.

While your on the subject, do your new Crower Rods fit the SVT piston or the Standard Zetec wrist pin?

**cfmfocus2** · 11-06-2009, 05:13 PM

The Crower rods work with the standard zetec wrist pin.

11-03-2009, 06:57 PM	#1 (permalink)
zbigity Rookie Join Date: Feb 2001 Location: Iowa City GO HAWKS Posts: 16	popping coming from intake manifold I have an 02 svt. when a idle I can hear popping coming from the intake manifold. could that be a fuel injector leecking? i also did a compression check #1-90 then 120 with oil #2 100 then 135 oil #3 105 then 145 oil #4 100 then 150 oil for compression. i know that is low for compression but i don't think that has anything to do with it. it was a junk yard motor with 90000 mi on it. the coolant temp sensor was bad and running rich I think that is why the compression is low and why the plug were almost melted away. i guess that is what you get for 500$ The plugs and coil have less then 5000 miles on them.every now and then the mil light comes on and there are 2 codes for the front o2 sensors i forget the code #. Also some times when i am accelerating right around 4800 and 5000 rpm it will loose power then after 5000 it is fine. I does not do it all the time either.

11-03-2009, 08:59 PM	#2 (permalink)
zbigity Rookie Join Date: Feb 2001 Location: Iowa City GO HAWKS Posts: 16	Re: popping coming from intake manifold well ring are bad. how much can the stock svt block be bored over. and where can i get over sized pistons?

11-04-2009, 04:32 AM	#3 (permalink)
Nik33615 Junior Member Join Date: May 2007 Location: Tampa(TnC) Posts: 86	Re: popping coming from intake manifold lol the title reminded me of the POP from my intake manifold when I cleaned the throttle body with carb cleaner....Started the car and POP! blew the intake manifold off the part that bolts to the head...don't do that kids...back to topic.. __________________ 2002 Pitch Black SVT Focus 6 Speed

11-06-2009, 05:09 PM	#5 (permalink)
COSVT03 Senior TEAM Member Join Date: Oct 2004 Posts: 1,209	Re: popping coming from intake manifold Ford offers 3 sets of pistons for that motor. Depending on tooling date of the engine, could have the smaller pistons. But getting replacements may be hard. But anyways. If your going to do the work, might as well put a nicer set of pistons in. While your on the subject, do your new Crower Rods fit the SVT piston or the Standard Zetec wrist pin? __________________ #3052 of 3985

11-06-2009, 05:13 PM	#6 (permalink)
cfmfocus2 Premier Sponsor Join Date: Nov 2004 Posts: 1,218	Re: popping coming from intake manifold The Crower rods work with the standard zetec wrist pin. __________________ William - Sales Dept / Central Florida Motorsports, Inc. - Est 1996 william@c-f-m.com / Live Chat / 407.339.9211 / Subscribe to CFM Forum

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