5S-FE MK2 Non-Turbo Engine Another poor gas mileage thread...

osephjay · 03-21-2010, 11:06 PM

Hey guys i recently had a "new" 5sfe swapped into my 2. the gas mileage sucks and my exhaust smells horrible. yesterday i placed a rag infront of one of the exhaust tips and had a friend hit the throttle. the rag had a ton of black residue on it... what could be the cause????

Gairloch · 03-22-2010, 12:12 AM

That means that you're running super rich. Did you replace the ignition stuff (plugs, wires, cap and rotor) before putting the engine in?

Have you checked the timing? You should be running at 10* BTDC.

How is it idling? Smoothly or jumping around?

osephjay · 03-22-2010, 09:17 AM

at idle it jumps around but under acceleration its fine.... plugs and wires were changed but not the distributor or the cap.

Gairloch · 03-25-2010, 02:12 PM

Visual inspection of the inside of the cap and the tip on the rotor will tell you if that needs to be replaced. A failed O2 sensor can also create the symptoms you're seeing.

osephjay · 03-25-2010, 11:58 PM

i'll check that out in the morning...would the vacuum hoses play a role in any of this?

Gairloch · 03-26-2010, 12:13 AM

Leaky vacuum hoses can cause the idle to jump around. Probably not the poor fuel mileage though.

GENESIS · 04-04-2010, 05:09 PM

Gairloch is right you running way too rich,check you 02,visually check the ecu if it been damage or tampered,I had the same situation I found out my ecu had been tampered.

check your all of your emission components,you might have the wrong or fouled plugs.Go back to whoever did your swap the should be able to fix it or have some kind of warranty.

osephjay · 04-05-2010, 01:09 PM

Well im on my way to the shop now so hopefully i'll get some positive results...

ShackC · 04-05-2010, 07:08 PM

Bad valve lash doesnt seem to be mentioned often, it caused my deuce to do all of the above.

Kerry Phillips · 04-05-2010, 07:54 PM

In addition to the o2 sensor, check your fuel pressure regulator, make sure it has a good solid vacuum line connected.
Kerry

osephjay · 04-09-2010, 11:13 PM

thank you all for your suggestions, i found the problem. the mechanics broke my vacuum sensor and had my fuel pressure regulator hooked into the charcoal canister. i can finally enjoy my car.... hopefully my next post will be my swap thread

Gairloch · 04-10-2010, 12:27 AM

Thanks for the update man. Always nice to hear how things come out.

03-21-2010, 11:06 PM	#1 (permalink)
osephjay No Skills Join Date: Dec 2009 Location: Brooklyn, NY Posts: 32 Thanks: 11 Thanked 0 Times in 0 Posts iTrader Rating: (0/0% )	Another poor gas mileage thread... Hey guys i recently had a "new" 5sfe swapped into my 2. the gas mileage sucks and my exhaust smells horrible. yesterday i placed a rag infront of one of the exhaust tips and had a friend hit the throttle. the rag had a ton of black residue on it... what could be the cause????

03-25-2010, 11:58 PM	#5 (permalink)
osephjay No Skills Join Date: Dec 2009 Location: Brooklyn, NY Posts: 32 Thanks: 11 Thanked 0 Times in 0 Posts iTrader Rating: (0/0% )	i'll check that out in the morning...would the vacuum hoses play a role in any of this? Last edited by osephjay; 03-25-2010 at 11:59 PM.. Reason: add more to original post

04-05-2010, 07:54 PM	#10 (permalink)
Kerry Phillips Cage Fighter Join Date: May 2006 Location: Chattanooga, TN area Posts: 299 Thanks: 0 Thanked 21 Times in 21 Posts iTrader Rating: (0/0% )	Too rich In addition to the o2 sensor, check your fuel pressure regulator, make sure it has a good solid vacuum line connected. Kerry

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03-22-2010, 12:12 AM	#2 (permalink)
Gairloch Dreaming of apexes Join Date: Aug 2005 Location: Minneapolis, MN Posts: 5,313 Thanks: 139 Thanked 296 Times in 264 Posts Blog Entries: 4 My Google Map iTrader Rating: (7/100% )	That means that you're running super rich. Did you replace the ignition stuff (plugs, wires, cap and rotor) before putting the engine in? Have you checked the timing? You should be running at 10* BTDC. How is it idling? Smoothly or jumping around?

03-22-2010, 09:17 AM	#3 (permalink)
osephjay No Skills Join Date: Dec 2009 Location: Brooklyn, NY Posts: 32 Thanks: 11 Thanked 0 Times in 0 Posts iTrader Rating: (0/0% )	at idle it jumps around but under acceleration its fine.... plugs and wires were changed but not the distributor or the cap.

03-25-2010, 02:12 PM	#4 (permalink)
Gairloch Dreaming of apexes Join Date: Aug 2005 Location: Minneapolis, MN Posts: 5,313 Thanks: 139 Thanked 296 Times in 264 Posts Blog Entries: 4 My Google Map iTrader Rating: (7/100% )	Visual inspection of the inside of the cap and the tip on the rotor will tell you if that needs to be replaced. A failed O2 sensor can also create the symptoms you're seeing.

03-26-2010, 12:13 AM	#6 (permalink)
Gairloch Dreaming of apexes Join Date: Aug 2005 Location: Minneapolis, MN Posts: 5,313 Thanks: 139 Thanked 296 Times in 264 Posts Blog Entries: 4 My Google Map iTrader Rating: (7/100% )	Leaky vacuum hoses can cause the idle to jump around. Probably not the poor fuel mileage though.

04-04-2010, 05:09 PM	#7 (permalink)
GENESIS Gate keeper of Redwood rd Join Date: Feb 2009 Location: dublin,ca Posts: 778 Thanks: 4 Thanked 23 Times in 24 Posts iTrader Rating: (4/100% )	Gairloch is right you running way too rich,check you 02,visually check the ecu if it been damage or tampered,I had the same situation I found out my ecu had been tampered. check your all of your emission components,you might have the wrong or fouled plugs.Go back to whoever did your swap the should be able to fix it or have some kind of warranty.

04-05-2010, 01:09 PM	#8 (permalink)
osephjay No Skills Join Date: Dec 2009 Location: Brooklyn, NY Posts: 32 Thanks: 11 Thanked 0 Times in 0 Posts iTrader Rating: (0/0% )	Well im on my way to the shop now so hopefully i'll get some positive results...

04-05-2010, 07:08 PM	#9 (permalink)
ShackC Shut up&enjoy the ride Join Date: Dec 2009 Location: Northern Cali. Posts: 924 Thanks: 47 Thanked 12 Times in 12 Posts My Google Map iTrader Rating: (2/100% )	Bad valve lash doesnt seem to be mentioned often, it caused my deuce to do all of the above.

04-09-2010, 11:13 PM	#11 (permalink)
osephjay No Skills Join Date: Dec 2009 Location: Brooklyn, NY Posts: 32 Thanks: 11 Thanked 0 Times in 0 Posts iTrader Rating: (0/0% )	thank you all for your suggestions, i found the problem. the mechanics broke my vacuum sensor and had my fuel pressure regulator hooked into the charcoal canister. i can finally enjoy my car.... hopefully my next post will be my swap thread

04-10-2010, 12:27 AM	#12 (permalink)
Gairloch Dreaming of apexes Join Date: Aug 2005 Location: Minneapolis, MN Posts: 5,313 Thanks: 139 Thanked 296 Times in 264 Posts Blog Entries: 4 My Google Map iTrader Rating: (7/100% )	Thanks for the update man. Always nice to hear how things come out.