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Topic Summary

erikv11 Icon

Posted 06 July 2009 - 01:32 AM

View Postrosso75, on 03 July 2009 - 12:29 PM, said:

On the fuel pressure regulator there is a hose where the fuel enters on one side, and a vacuum hose on the other side. The vacuum hose runs to a fitting on the manifold and an increase in vacuum increases fuel pressure. If fuel is getting by the diapharam inside it will get sucked through the vacuum hose, into the intake, and run rich.

OK well when I shut off the car then pull the vacuum line to the FPR, there is a faint whiff of fuel from the vacuum line. Checked it several times the last few days, always the same, no doubt about it there is some gas in that line.

Maybe this explains the crappy mileage I've been getting for like a year. But no codes for rich, no black smoke except after long period of idling which I think may be valve stem seals, PCV recently done.

I'm going to replace the fuel pressure regulator, it is either original or has minimum 90k on it since I bought the car.

rosso75 Icon

Posted 04 July 2009 - 01:16 AM

Found it. I got a hole about the size of a quarter on the top side of the lower innercooler hose. I didn't quite get my fingers all the way around it when I was under the car checking the first time.

I had a friend once who used to say "You can't tell for sure until you've checked it at least 3 times." I found it on the second check. Thanks for the suggestions.

rosso75 Icon

Posted 03 July 2009 - 05:29 PM

Quote

which little vacuum line (pic maybe?)?


On the fuel pressure regulator there is a hose where the fuel enters on one side, and a vacuum hose on the other side. The vacuum hose runs to a fitting on the manifold and an increase in vacuum increases fuel pressure. If fuel is getting by the diapharam inside it will get sucked through the vacuum hose, into the intake, and run rich. I'll try and attach a pic.

I hadn't thought of it, since the pressure regulator is new, but checked it anyway. No fuel smell.

Hmmm....hit the wrong button. Lets try this....

randomdude Icon

Posted 03 July 2009 - 05:02 PM

when my car was blowing black smoke, and losing power, it was because i had a hole the size of a quarter in my intercooler hose where the IAC hose meets it. no codes were thrown.

erikv11 Icon

Posted 03 July 2009 - 03:16 PM

View Postshellshock, on 03 July 2009 - 02:04 AM, said:

Fuel pressure regulator. I'm positive of it. Remove the little vacuum line and see if you smell gas in it. My buddys 850T was running rich and blowing black smoke and this was the problem. Easy 10 minute fix

hey I'm curious can someone clarify - which little vacuum line (pic maybe?)?
is he supposed to smell gas, or not supposed to?

shellshock Icon

Posted 03 July 2009 - 07:04 AM

Fuel pressure regulator. I'm positive of it. Remove the little vacuum line and see if you smell gas in it. My buddys 850T was running rich and blowing black smoke and this was the problem. Easy 10 minute fix

TorqueSteer Icon

Posted 03 July 2009 - 06:37 AM

View PostYoung Burnsy, on 02 July 2009 - 10:07 PM, said:

Well it's generally understood here that using platinums or any multi tip plugs in these cars is a bad idea. So do your self a favor and get some new coppers or OEM plugs.

As far as the black smoke issue since it's not consistent it would probably best for you to start with a stage 0.



Not true. When my car was stock, I ran Bosch Platinum 4 tip plugs for 2 years without any problems, and with great performance for a stock car. I switched to copper only when I began to mod the car and increase boost.

rosso75 Icon

Posted 03 July 2009 - 04:14 AM

I've always put Bosch platinum's in everything I've owned, which has been pretty much all european. I've never had a problem with them, though I've heard about it, and actually seen it once on a Ford 2.3 Mustang. I figured with all the other Bosch electronics in there, it should run good with their plugs too. I'll give it a shot though.

Swapped the MAF from my other '94. No change.

Young Burnsy Icon

Posted 03 July 2009 - 02:07 AM

Well it's generally understood here that using platinums or any multi tip plugs in these cars is a bad idea. So do your self a favor and get some new coppers or OEM plugs.

As far as the black smoke issue since it's not consistent it would probably best for you to start with a stage 0.

rosso75 Icon

Posted 03 July 2009 - 01:34 AM

Hey....
I obviously got this in the wrong category somehow. Can a mod move it for me please?
thanks

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