What symptoms cause this blown fuse??

[jojo]

Was driving to work this morning, got half way out of the neighborhood and boom!! the car just dies without warning any way first i checked under the hood at all the wiring ect.. only to find that everything was in tact from last night, and it ran fine on the way home from work, and then part of the way to work this morning.

Anyway i got to the fuse box and found that the fuse that goes into the (fp/inj) slot was shot. Went down to Auto Zone real quick having a feeling this was the problem. I replaced with the new 15A fuse and bingo the car fired right up drove to work with know problem. But i guess this is one of those lessons on where to look as the reason the fuse blew in the first place. I checked all the wires that come off the injectors, as far as i could see nothing was kincked or anything. I looked in the rear under the car by the fuel tank and checked the wires there to, but didnt see anything out of the ordinary. The fuel pump is fairly new Walboro 340 w/hotwire and the 009s are pretty new also maybe 1000k on them or so.

So if anyone could give me some insight on where else to look, or if there is something i am missing here please let me know your experiences and opinions. Like i was saying it seems to be running great right now that i replaced the fuse. But will i blow another?? is there something i should start looking for.

thanks

jojo

 

[6pack]

Check your injector harness good. When I bought my car the fuse was blown...replaced it and it did not blow for about two weeks blew again and keep blowwing everytime I replaced the fuse this time. Anyway turns out the injector harness was grounding to the fuel rail! Mine has't blown since. Hope that helps!

 

[jojo]

Originally posted by 6pack
Check your injector harness good. When I bought my car the fuse was blown...replaced it and it did not blow for about two weeks blew again and keep blowwing everytime I replaced the fuse this time. Anyway turns out the injector harness was grounding to the fuel rail! Mine has't blown since. Hope that helps!

Thanks 6

other suggestions please?

thanks

jojo

 

[Chuck Leeper]

harness problems??

Some harness problems are at/near the EGR valve. The valve base gets hot enough to cause wiring insulation to fail over time.
Could be there. Move the wiring and then look very close for signs that the insulation is cooked....

 

[jojo]

Re: harness problems??

Originally posted by Chuck Leeper
Some harness problems are at/near the EGR valve. The valve base gets hot enough to cause wiring insulation to fail over time.
Could be there. Move the wiring and then look very close for signs that the insulation is cooked....

If cooked then what Chuck??

thanks

jojo

 

[getchasum]

jojo, check near the driverside header for the two loose wires, one is green and one is brown. The brown one goes to the fuel pump. Mine had got against the header, grounded out on the header and kept blowing fuses. Tied them up with a wire tie and everything is fine now. It may just be what you have going on.

 

[MSDGN]

Did you replace the stock oil pressure sender with an aftermarket one for a guage?...if so where is the original wiring for the stock sender?...if it's hanging loose anywhere near metal it will short out and BAM...FP/INJ fuse blows...

 

[Chuck Leeper]

If cooked, then?

You can remove it and patch it. Or you can buy a new harness from one of the TR vendors.. I think the last 1 I got was about $60.

Follow up on the other ideas too!

 

[jojo]

Originally posted by MSDGN
Did you replace the stock oil pressure sender with an aftermarket one for a guage?...if so where is the original wiring for the stock sender?...if it's hanging loose anywhere near metal it will short out and BAM...FP/INJ fuse blows...

MSDGN if you could be a little more specific. I had a VDO oil pressure gauge put in, but i didnt do it myself. It sits along side with the enginge temp gauge inside the open console in front of the shifter. I didnt do the wiring myself on the gauges, im kind of still learning about the wiring on these cars also. Can you give me a specific place to look??

thanks

jojo

 

[jojo]

Originally posted by getchasum
jojo, check near the driverside header for the two loose wires, one is green and one is brown. The brown one goes to the fuel pump. My had got against the header, grounded out on the header and kept blowing fuses. Tied them up with a wire tie and everything is fine now. It may just be what you have going on.

getchasum i will check that out also, im at work right now i have the car with me. Can you give me an exact area to look? i dont want to dirty up the school close if you know what i mean. Billing manager has to stay clean looking

thanks

jojo

 

[jojo]

Re: If cooked, then?

Originally posted by Chuck Leeper
You can remove it and patch it. Or you can buy a new harness from one of the TR vendors.. I think the last 1 I got was about $60.

Follow up on the other ideas too!

Ok Chuck i will check that out. Is there anything recommended for patching this up?? black electrical tape ect... where from??

thanks

jojo

 

[jojo]

Well last night on the way home from work, (just about dark) my car died again!! knowing it was the same thing, i checked the fuse and it was blown!! so stuck on the side of the freeway with what little light was left, i tried checking all suggestions in this thread with what i had to work with. Then after all failed i had three fuses left from the package i bought from auto zone. Now what is happening is the fuses are just blowing as soon as i turn the key to start the car!!. Im obviously grounding out somewhere but where?? can you guys give me some more suggestions? or possibilities? i had the car towed home last night, after waiting for the towing guy for about three hours!! this is the second problem that i couldnt solve while out with my car. The first was when the powermaster went, now this!! both times being towed home. What am i chasing here? could it be a bad fuel pump? or am i just missing something simple like a bad ground wire somewhere?. The car is sitting in the garage right now, with little time to get to it, with work and lack of space in the garage and daylight. Anyother specifics that i can check for??

thanks

jojo

 

[salvageV6]

Wiring to the fuel pump including inside the tank.

Wiring to the injectors.

Usually it's in a hot wire kit or fuel pump add on stuff.

Or the injector harness is shorted.

Since it is a dead short now try this test.

Unplug the injector harness under the coil pack. Big square plug with about 8 wires or so in it.

Put a new fuse in. If it blows it is most likely fuel pump related.

If it doesn' blow it's in the harness wiring you just disconnected near the injectors.

This assumes a dead short and always popping fuses like you said.

 

[jojo]

Originally posted by salvageV6
Wiring to the fuel pump including inside the tank.

Wiring to the injectors.

Usually it's in a hot wire kit or fuel pump add on stuff.

Or the injector harness is shorted.

Since it is a dead short now try this test.

Unplug the injector harness under the coil pack. Big square plug with about 8 wires or so in it.

Put a new fuse in. If it blows it is most likely fuel pump related.

If it doesn' blow it's in the harness wiring you just disconnected near the injectors.

This assumes a dead short and always popping fuses like you said.

Ok Salvage ill give that a try as soon as i can. So i will disconnect the harness below the coil pak and leave it disconnected, put a new fuse in and turn the key while harness is disconnected right? if it blows the fuse, it will be pump related ect. if it doesnt it will be the harness right? if it is the harness i will assume i will have to replace the whole harness? if so, suggestions on where to get it? and is it an easy enough job to do myself? keep in mind im trying to solve and replace all problems myself if i can, ive learned quite a bit since being on this board and have gone from knowing really nothing about these cars mechanically, to fixing little things as they come up myself

thanks again

jojo

 

[MSDGN]

The stock oil pressure sender uses a 3-wire molded connector
...find the brass piece on the front lower part of the engine near the oil pump where the turbo oil feed line is connected...you will have only an aftermarket sender with one wire or both the aftermarket and stock sender...if you only have the aftermarket one look for the 3-wire molded connector...it may be zip-tied out of the way but still may be contacting the block and shorting out...it will cause that fuse to blow as soon as you turn the key.

 

[jojo]

Originally posted by MSDGN
The stock oil pressure sender uses a 3-wire molded connector
...find the brass piece on the front lower part of the engine near the oil pump where the turbo oil feed line is connected...you will have only an aftermarket sender with one wire or both the aftermarket and stock sender...if you only have the aftermarket one look for the 3-wire molded connector...it may be zip-tied out of the way but still may be contacting the block and shorting out...it will cause that fuse to blow as soon as you turn the key.

Ok MSDN i will check this to. It is located near the turbo return line? probably the line that is a little leaky right under the turbo. I seen where the wiring goes, kinda like where the 02 sensor is located, right in between there somewhere right?

thanks again

jojo

 

[MSDGN]

Follow the oil feed line from top of the turbo down to the brass piece screwed into the block...the oil pressure sender/senders will also be screwed into that piece...to use the stock sender along with an aftermarket one you need an adapter...many don't bother with this and just leave the stock sender off...the wiring is then tied off somewhere...look around the front of the block in that area and see if you have a connector that isn't attached to anything...

 

[salvageV6]

By all means check that oil sender wire plug first. Tape it up good if it's floating around down there.

If you find it's the inj. harness what I would do would be to give it a very very close inspection by pulling the fuel rail and harness by following the replacing injector sequence at gnttype.org.


Don't do anything until you check the plug first.

 

[jojo]

Ok MSDN and Salvage, i will check that asap and thanks again for all the help and suggestions. Just another thing to learn

thanks

jojo

 

[jojo]

Originally posted by getchasum
jojo, check near the driverside header for the two loose wires, one is green and one is brown. The brown one goes to the fuel pump. Mine had got against the header, grounded out on the header and kept blowing fuses. Tied them up with a wire tie and everything is fine now. It may just be what you have going on.

Upate: I just want to thank everyone for all the help and suggestions for the problem posted about the fp/inj fuse continually blowing. It was kinda funny because the night i got stuck on the freeway for three hours i was under the hood with my little Mag Light. I couldnt see much was real dark. But i noticed a single wire behind and below the rest of the wire bundle behind the alternator and right in front of the drivers side front header. It was real hard to see and real frustrating because i had to angle myself and my head twisting to see this friggin wire by itself that was melted on the header (i found out on friday when i went to try and find the culprit). Anyway that night i was trying to get a hold of the wire and wiggle it to break it loose (didnt know it was melted on at the time, because i couldnt see a thing. I just knew it didnt look right). And didnt know if i was going to screw something up if i did pull it loose, because i couldnt really see what the hell i was doing. But that was the problem, i found on friday in the daylight when i could see. I just got a flat head screw driver and scraped underneath the connector to free the wire. It came right off, and i looked at it as sure enough it was somewhat heated up pretty good i just tied it up at the top of the rest of the bundle and secured some black electric tape on it, put a new fuse in and BAM!! started right up and drove around for a while with a sense of accomplishment Thanks again for all that replied and helped me out with suggestions.

jojo