Fuel Pump Relay Fuse Keeps Blowing!!!!
12-14-2010, 09:01 PM
#31
5th Gear Member
Join Date: Dec 2006
Location: Redding, CA
Posts: 4,552
CORRECTION: Just started car and let it idle....It misses at idle too! I got like 13 misfires in 5 min. I do not believe it was doing this the other days it was idling or when I first let it run and warm up before driving it last night. Hmmm does the fact that it's getting worse indicate anything? .......It's also really cold (colder than the other nights)
Now, last night when I drove the car I got gas (93 as always). I was not paying attention to misfires on the gauge before so I can't say for certain but I didn't notice any misfires by feel or notice any on the gauge, but AGAIN, I wasn't really paying attention. What I do know for certain is that I noticed the misfires after I got gas. IDK i do get gas from this Exxon all the time and I've never gotten a misfire before. Question: What would you do? Try and siphon the tank? If this gas was "bad" could it have already fouled the plugs?
I wish I was paying more attention, I can't be certain if it was missing before the fill-up or not although I think I would have noticed at idle if it was as bad as today....Input?
Now, last night when I drove the car I got gas (93 as always). I was not paying attention to misfires on the gauge before so I can't say for certain but I didn't notice any misfires by feel or notice any on the gauge, but AGAIN, I wasn't really paying attention. What I do know for certain is that I noticed the misfires after I got gas. IDK i do get gas from this Exxon all the time and I've never gotten a misfire before. Question: What would you do? Try and siphon the tank? If this gas was "bad" could it have already fouled the plugs?
I wish I was paying more attention, I can't be certain if it was missing before the fill-up or not although I think I would have noticed at idle if it was as bad as today....Input?
Ever since my motor has been built I have had a sound that is similar to a miss at idle.
12-15-2010, 07:29 AM
#33
1st Gear Member
Join Date: Nov 2010
Location: MI
Posts: 74
Have you ever run any kind of fuel additive or octane booster since your put the new HTO's in? That will foul out the plugs pretty quickly, which would also cause a miss.
12-15-2010, 07:35 AM
#34
5th Gear Member
Join Date: Dec 2006
Location: Redding, CA
Posts: 4,552
I would be worried about my pump working intermitantly and going lean while under boost.
12-15-2010, 05:46 PM
#35
4th Gear Member
Thread Starter
Join Date: Feb 2008
Location: NJ
Posts: 1,496
No additives the car drove on one trip since the plugs before I tore it down.....
The discoloration actually looks like some yellow color came off of an adjacent wire......Had my mech friend look and he said it looks fine. It doesn't look like burn.
As far as a wiring issue idk, From what I can tell the misfires have gotten worse since the first couple run cycles
The discoloration actually looks like some yellow color came off of an adjacent wire......Had my mech friend look and he said it looks fine. It doesn't look like burn.
As far as a wiring issue idk, From what I can tell the misfires have gotten worse since the first couple run cycles
12-15-2010, 10:10 PM
#36
4th Gear Member
Join Date: Dec 2010
Location: Gallifrey
Posts: 1,596
In that same vein I should have taken my own advice and checked the insulation to my pipes last week when I noticed water stopped running to my sink because it froze, came home to a busted pipe today, would have saved me all kinds of headaches.
On the plus side I do have a sweet view of my attic from the kitchen now.
Last edited by wayne613; 12-15-2010 at 11:03 PM.
12-16-2010, 10:23 AM
#37
5th Gear Member
Join Date: Dec 2006
Location: Redding, CA
Posts: 4,552
No additives the car drove on one trip since the plugs before I tore it down.....
The discoloration actually looks like some yellow color came off of an adjacent wire......Had my mech friend look and he said it looks fine. It doesn't look like burn.
As far as a wiring issue idk, From what I can tell the misfires have gotten worse since the first couple run cycles
The discoloration actually looks like some yellow color came off of an adjacent wire......Had my mech friend look and he said it looks fine. It doesn't look like burn.
As far as a wiring issue idk, From what I can tell the misfires have gotten worse since the first couple run cycles
When I have dealt with something like this in the past it had always been a dead short inline with the fuse.
12-16-2010, 04:58 PM
#39
1st Gear Member
Join Date: Nov 2010
Location: MI
Posts: 74
K, try and explain this mis again.
Generally speaking on SC'd cars if you start to develop a mis over 3k RPM's it's related to either the spark plugs (spark blow out) or the fuel system running lean. Either of which feels like the car is cutting out, but either would generally happen every time you get into full boost.
What your describing sounds like a very inconsistent mis, and your saying it happens at an idle, but your not getting any check engine light. This sounds like a vacuum leak, but again that should be consistant, not getting worse. If it was a small leak the mis could go away once you give it some gas.
But are you saying the mis continues as the RPM's climb, but doesn't get any worse?
Generally speaking on SC'd cars if you start to develop a mis over 3k RPM's it's related to either the spark plugs (spark blow out) or the fuel system running lean. Either of which feels like the car is cutting out, but either would generally happen every time you get into full boost.
What your describing sounds like a very inconsistent mis, and your saying it happens at an idle, but your not getting any check engine light. This sounds like a vacuum leak, but again that should be consistant, not getting worse. If it was a small leak the mis could go away once you give it some gas.
But are you saying the mis continues as the RPM's climb, but doesn't get any worse?
01-08-2011, 11:49 AM
#40
Join Date: Jan 2011
Location: Oregon
Posts: 6
I need Help with BLOWN FUSE TOO!
i was just wondering if you ever got your problem solved? I just got my install done last night (at 2:30AM!)...
The engine will crank but not fire.. When I checked the fuse you remove in the beginning of the Roush M90 SC install it is blown.. I believe this fuse is for the fuel pump...
I discovered that it will blow as soon as the ignition is turned on... The engine does not have to crank for it to blow...
So...
1. Did you get yours fixed... and how?
2. How do I check for a short?
Thank you all~
The engine will crank but not fire.. When I checked the fuse you remove in the beginning of the Roush M90 SC install it is blown.. I believe this fuse is for the fuel pump...
I discovered that it will blow as soon as the ignition is turned on... The engine does not have to crank for it to blow...
So...
1. Did you get yours fixed... and how?
2. How do I check for a short?
Thank you all~
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