MattSapp95_T/A

iTrader: (35)

Well i finally fixed my high rpm miss...

installed EFI Connection with a custom built harness

Now I have another weird problem.....

I have not had a belt on the car because no one had the right size in stock... Car runs great without the belt... Here is where it gets weird...

The belt come in the mail today and when I installed it the car will start and the fuel pump dies (I can see the fuel pressure go to zero on my gauge) and the temp gauge goes to max??? Take the belt back off and it runs fine..

so I figure it Has to do something with the alternator charging with the belt on so I decided to unplug the alternator...the car then won't even turn the starter....???

plug the alternator back in and remove the belt and it runs like a champ....

anybody have any good ideas??

fex77k

iTrader: (2)

How is the alt grounded(don't you have it sitting where the A/C is)? How is the block ground?

defaultexistence

iTrader: (11)

obviously something is grounding out or pinned wrong check pcm wiring and harness connections

MattSapp95_T/A

iTrader: (35)

I have a ground strap on the back of the alternator that goes to the block...this is how I have had it for months now with no issues...

Yea this is what I am thinking but I don't really even know where to start....

SoxXpupPeT

iTrader: (34)

Try putting one side of that strap to the chassis where the battery is connected too...

MattSapp95_T/A

iTrader: (35)

Ok I will give it a try...

I am just baffeled WHY the car wont even try to engage the starter if you unplug the alternator?

I don't even see how that makes since...the red single wire just sends a 12volt signal to the alt to start charging right???

Matt

defaultexistence

iTrader: (11)

Right........
check your pinning on the ecm and verify the alt is in the right place and so-forth..
check for pinched harness

fex77k

iTrader: (2)

Well if it won't engage the starter with it disconnected, try and jump the starter manually.

1badzee

iTrader: (12)

Solution: Swap back to LT1 pcm/opti

fex77k

iTrader: (2)

He is going to pop out of your screen and slap you.

defaultexistence

iTrader: (11)

^^^^^^^^^^^ LOL! especially after all the work so far

1badzee

iTrader: (12)

Sarcasm guys, sarcasm...

MattSapp95_T/A

iTrader: (35)

haha....yea i dont want to hear anything about my car and an opti in the same sentence.... killed a 600 Dynaspark in less than a week....

i will take a wiring problem that I can track in my garage over a high rpm miss that has kicked my *** anyday....

1badzee

iTrader: (12)

^ Lemme get that Dynaspark. I've got $40...


Edit: Actually just read the original post. Holy crap that's weird! Wish I had something more productive to share.

MattSapp95_T/A

iTrader: (35)

Yea I was with you....


I traced the exciter wire back and all is good.... I turn the key and it has 12v at the alt plug....

Then it has 12 volts all the time too on the back side of alt too where the battery wire goes..... even with the car off

1badzee

iTrader: (12)

^ That's normal.. It's just a positive connection right off the battery. It should be +/- 12v. So you're saying the car runs like poop with the alternator and belt hooked up?

MattSapp95_T/A

iTrader: (35)

Car runs great with the alt hooked up an NO belt....stick the belt on and when you start the car the fuel pump quits and the car shuts off....and the temp gauge goes to hot (even though the motor is not hot....

1badzee

iTrader: (12)

That is just mind boggling.. Holy crap lol. Everything wired up right? Start with the basics. It is usually something stupid with these cars. Good luck buddy

MattSapp95_T/A

iTrader: (35)

Can anyone tell me what the wires under the dash go to? there are 3 pigtails that go inside the car... 1 is flat and has 4 spots but only 3 wires...1 of them is a large purple wire which i believe goes to the starter... the other is black with a white stripe which i assume is a ground and the 3rd is all grey???

MattSapp95_T/A

iTrader: (35)

Yea I am the king of getting waist deep and then realizing something stupid is wrong....

Like a fuse or wire undone....

Alt worked fine last week so maybe I don't have something in the harness done right....ugh someone kill me