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I have a 95 saturn sl dohc.I will not run with the fuel ...

Sent to Car Experts September 22 12:50 AM

I have a 95 saturn sl dohc.It will not run with the fuel pump fuse in place but will idle for 20 minutes with it out. add the fuse and it floods the cylinders. replaced the regulator, coolant temp sen, ecm and ignition control module. please help!!!! once the car runs for about twenty minutes with the fuel pump fuse you can out the fuse in for about two seconds and no more than two seconds, it will run again with the fuse out only.

Edited by Customer (name blocked for privacy) on September 22 2005 at 1:04 AM

Customer (name blocked for privacy)
Status:  Closed   Value: $20
Answer
September 22 1:05 AM (14 minutes and 56 seconds later)
         
REPLIEDCheck Mark
i sounds like a bad fuel pump it pumping to much fuel or a fuel regulator
casey mason -- Auto Mechanic -- Expert's Profile
collision repair and auto repair
Reply
September 22 1:08 AM (2 minutes and 56 seconds later)
         
Reply to casey mason's Post: replaced the fuel regulator and test the pump. put in new fuel rail, made sure there was no restriction in the return line and fiter.
Customer (name blocked for privacy)
Answer
September 22 1:17 AM (8 minutes and 53 seconds later)
         
REPLIEDCheck Mark
i had a firebird that the pump tested fine but the it was flooding the car out
casey mason -- Auto Mechanic -- Expert's Profile
collision repair and auto repair
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September 22 1:24 AM (7 minutes and 10 seconds later)
         
well i had a extra pump from a saturn i parted out but the results were the same....never seen anything like this.
Customer (name blocked for privacy)
Answer
September 22 1:28 AM (3 minutes and 39 seconds later)
         
REPLIEDCheck Mark
what about the computer may be its telling the pump to pump to much.what about the spark plug are they hot enough.
casey mason -- Auto Mechanic -- Expert's Profile
collision repair and auto repair
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September 22 1:31 AM (3 minutes and 59 seconds later)
         
replaced both the spark plugs and the computer/
Customer (name blocked for privacy)
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September 22 1:33 AM (1 minute and 55 seconds later)
         
Reply to casey mason's Post: there are no trouble codes.
Customer (name blocked for privacy)
Answer
September 22 1:34 AM (18 seconds later)
         
REPLIEDCheck Mark
will the car run with the fuse in it or does it completely flood out. you might have to put a performance fuel regulator that u can adjust
casey mason -- Auto Mechanic -- Expert's Profile
collision repair and auto repair
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September 22 1:35 AM (1 minute and 15 seconds later)
         
Reply to casey mason's Post: Iwas so sure it was the computer i took it back and got a third one,,,,same results
Customer (name blocked for privacy)
Answer
September 22 1:37 AM (2 minutes and 13 seconds later)
         
REPLIEDCheck Mark
put a adjustable fuel regulator on it so you can control the fuel pressure
casey mason -- Auto Mechanic -- Expert's Profile
collision repair and auto repair
Reply
September 22 1:38 AM (23 seconds later)
         
Reply to casey mason's Post: it completely floods out. I can almost redline it and put the fuse in and ut completely follds all the cylinders. The regulator that comes on the car can be adjusted.
Customer (name blocked for privacy)
Answer
September 22 1:41 AM (3 minutes and 17 seconds later)
         
REPLIEDCheck Mark
turn it down so it dont get as much fuel. What about hotter plugs and bigger wires so it gets more fire
casey mason -- Auto Mechanic -- Expert's Profile
collision repair and auto repair
Reply
September 22 1:41 AM (33 seconds later)
         
Reply to casey mason's Post: I checked online weeks ago and the guys that race saturn told me about the adjustments om the factory regulator,,,ther is no other made.
Customer (name blocked for privacy)
Answer
September 22 1:43 AM (1 minute and 21 seconds later)
         
REPLIEDCheck Mark
put another one on it under the hood so you have control
casey mason -- Auto Mechanic -- Expert's Profile
collision repair and auto repair
Reply
September 22 1:45 AM (2 minutes and 45 seconds later)
         
Reply to casey mason's Post: I turn it as low as it woud go,,replace plugs with rapid fires, new wires, coils...ive replaced everything visable on the car including crank sensor,tps iac, cts and fuel line and rail.
Customer (name blocked for privacy)
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September 22 1:47 AM (1 minute and 22 seconds later)
         
Reply to casey mason's Post: where would i find it...from my under standing there is not one made,
Customer (name blocked for privacy)
Answer
September 22 1:47 AM (9 seconds later)
         
REPLIEDCheck Mark
what about the fuel injectors
casey mason -- Auto Mechanic -- Expert's Profile
collision repair and auto repair
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September 22 1:48 AM (1 minute and 7 seconds later)
         
Reply to casey mason's Post: replaced the entire fuel rail with injectors.
Customer (name blocked for privacy)
Answer
September 22 1:50 AM (1 minute and 39 seconds later)
         
REPLIEDCheck Mark
try sps.com(saturn performance specialist) or nopi.com or just go to you local saturn dealer they deal with sps
casey mason -- Auto Mechanic -- Expert's Profile
collision repair and auto repair
Answer
September 22 7:25 AM (5 hours and 35 minutes and 1 second later)
         
REPLIEDCheck Mark
Slow down here. You need to start finding out exactly what is happening when that fuse is installed. You need to install a fuel pressure gauge and a scan tool would be very helpfull also. You need to find out EXACTY what changes when that fuse goes in. I don't think it has anything to do with fuel pressure. That is a bypass system meaning it doesn't matter how much pressure the pump has, the regulator will bypass all of the excess back to the tank. I suspect something may be shorting the injecter signal wires somehow. Another thing you could try is to get a noid light and plug it into one of the injecters and watch what happens to the pulse when you plug that relay in. Once you know what event this is triggering, it will be easier to find out why.

Edited by Hammer Time on September 22 2005 at 7:26 AM

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September 22 7:32 AM (6 minutes and 50 seconds later)
         
Reply to Hammer Time's Post: I did install a noid light and scan tool, the pulse were normal the sensor values were normal,
Customer (name blocked for privacy)
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September 22 7:33 AM (1 minute and 26 seconds later)
         
Reply to casey mason's Post: don't think were on the right track with the regulator.
Customer (name blocked for privacy)
Answer
September 22 7:45 AM (11 minutes and 27 seconds later)
         
REPLIEDCheck Mark

So, what changes when the relay is plugged in.

Did the fuel pressure change?

Did the pulse width change?

Did the O/2 readings spike?



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September 22 9:15 AM (1 hour and 30 minutes and 45 seconds later)
         
Reply to Hammer Time's Post: everything remained normal until i accelerated. fuel pressure was reduced o2 became lean
Customer (name blocked for privacy)
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September 22 9:21 AM (6 minutes and 6 seconds later)
         
REPLIEDCheck Mark

You said it was flooding the cylinders. That's not what the O/2 is saying. You say the fuel pressure drops on acceleration, that's the opposite of what it should do. It should increase about 5-10lbs if the regulator is working properly.

Try momentarily pinching off the fuel return hose and see how high the fuel pressure jumps.



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Hammer Time -- L1 Master Technician -- 98% Positive Feedback on 2716 Car Accepts
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September 22 11:55 AM (2 hours and 34 minutes and 6 seconds later)
         
what you have to remember is that the fuel pump is off because the fuse is removed, which is the reason for the fuel pressure drop. if i put the fuse back in the pressure increases but it floods the cylingers and the engine stalls.
Customer (name blocked for privacy)
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September 22 12:00 PM (4 minutes and 43 seconds later)
         
REPLIEDCheck Mark

I asked you earlier what happens when the fuse is installed.

Did the fuel pressure change?

Did the pulse width change?

Did the O/2 readings spike?




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Hammer Time -- L1 Master Technician -- 98% Positive Feedback on 2716 Car Accepts
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September 22 4:39 PM (4 hours and 38 minutes and 22 seconds later)
         
Reply to Hammer Time's Post: it remains the same as the pump isn't on.
Customer (name blocked for privacy)
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September 22 4:41 PM (2 minutes and 26 seconds later)
         
REPLIEDCheck Mark

Your getting more confusing with every post.

What changes when the fuse is put in?



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September 22 4:44 PM (2 minutes and 49 seconds later)
         
within 2 seconds of installing the fuse the engine is flooded and stalls. readings are almost impossible pressure starts to increase 02 goes crazy...it does spike. the fumes are so strong once the fuse is installed that the shop has to be evacutated.
Customer (name blocked for privacy)
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September 22 4:48 PM (4 minutes and 28 seconds later)
         
REPLIEDCheck Mark
OK, so what does the fuel pressure gauge say without the engine running and the fuse installed?

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Hammer Time -- L1 Master Technician -- 98% Positive Feedback on 2716 Car Accepts
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September 22 4:48 PM (3 seconds later)
         
Reply to Hammer Time's Post: fuel pressure increases, spray pattern is wider, o2 spikes, cars dies.when fuse is put in with car running, car will not start with fuse installed it has to be started with the fuse out.
Customer (name blocked for privacy)
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September 23 12:03 PM (19 hours and 15 minutes and 7 seconds later)
         
Reply to Hammer Time's Post: replied
Customer (name blocked for privacy)
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September 23 12:05 PM (1 minute and 50 seconds later)
         
Reply to Hammer Time's Post: I'll get a reading this morning.
Customer (name blocked for privacy)
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