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1991 Oldsmobile replaced gas line, no longer cranks.
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allthatufear
New User
Apr 14, 2009, 7:08 AM
Post #1 of 5
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1991 Oldsmobile replaced gas line, no longer cranks.
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Ok I have a 1991 Oldsmobile Delta 88, with a 3.8 L engine. Over the past couple weeks I have noticed that the gas line was leaking. We tried to patch the gas line but it didn't work too well so we decided to replace both the pressure line and the return gas lines. We replaced both with no problems, but when we went to crank it, it tries to crank but never fully turns over. It's strange cause since we owned the car we have NEVER had a problem with the car cranking. We checked the fuel pressure and it seems to be fine, we took off the pressure line and it getting quite a bit of fuel. So then we thought it could be the Fuel Pressure Regulator. We then replaced that and it still won't crank. We then thought maybe it could be a kink in the line cause we had to bend the fuel line in place. So we replaced the lines with new straight lines and still won't crank. We have went back and retraced everything and cannot figure out what is wrong. There is only one thing I can think of and it is the fuel pump, but I can't see that being a problem cause it wasn't a problem before we replaced the gas lines. It seems like the fuel flow is fine, all the way up to the regulator, but it won't flow through the fuel rail. Reason I say that is because after the numerous times of trying to crank it and getting fuel flow when we removed the fuel rail it was bone dry.
We have done everything I can think of, and i am at a lost for what to do next. We also sprayed starting fluid into the throttle body, the car then starts up but dies almost immediately. Anyone have any idea what do try next? Thanks!!
Justin
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Guest
Anonymous Poster
Apr 14, 2009, 7:41 PM
Post #2 of 5
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Re: 1991 Oldsmobile replaced gas line, no longer cranks.
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Your post is a little confusing but I think I got it at the end....
FYI... No crank---Means you turn the key & nothing or it just clicks... the engine physically doesn't turn over. (starting system prob)
No start-- You turn the key & engine turns over like normal but just won't start (drivability prob)
Your problem sounds like a no start since it will run on starting fluid.
Check the basics. since it ran before grab a test light & check all your fuses 1st. if ok get a fuel pressure guage & hook it up to the rail & get a pressure reading....(lots of gas, squirting for days, dumpin a ton, don't cut it....get a pressure reading.  )
If you're in the 30 to 40 psi range then get a noid light & check your injector pulse....
That should get you in the ballpark.....
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flgmtech1
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Apr 15, 2009, 4:48 AM
Post #3 of 5
(1426 views)
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Re: 1991 Oldsmobile replaced gas line, no longer cranks.
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Okay, if you can crank it with starting fluid say carb cleaner, throttle body cleaner etc.. and it starts and then stalls I would say the car is cranking. If you are using a fuel pressure gauge on the fuel rail then the rail is getting fuel or you would have no pressure on your gauge./. Are you using a fuel pressure gauge on the rail??
If so what is the pressure key on engine off? How about when you are cranking it? You want to see 60 psi, NEXT, take a test light and remove any one of the injector connectors and see if you are getting a pulse by going across the connectors with the test light this way you are seeing the pulsed ground, If you do not see a pulse while cranking then test from battery ground with the test light and touch either terminal of the injector connector key on engine off and see if it lights up. This means it has power but it may not be receiving permission by the PCM to pulse the injectors. If you determine their is pressure, but not pulse, AND you have power on the injector then you need to see if when the key is on your security light goes off, or if it stays on steady also if it is flashing which could point to a security VTD issue which will prevent fuel injector pulse as the fuel mode cut off is engaged.
Start with the basics....are you really using a fuel pressure gauge? Because if you are, then your service fitting is On the Fuel rail so it only stands to reason your fuel rail is not dry if you have fuel pressure, if you are not using a gauge Get one and see what the pressures if any are present. This is the first step. the second step is making sure you placed the pressure side into the pressure side and not into the return side. I know is sounds stupid but it has happened. Also, check for pulse on your injectors and if you have neither pulse or power then take your test light and test all fuses, both underhood and if the IP compartment of the left side and behind the glove box on the right side.
I hope this helps
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Guest
Anonymous Poster
Apr 15, 2009, 9:58 PM
Post #4 of 5
(1415 views)
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Re: 1991 Oldsmobile replaced gas line, no longer cranks.
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60 psi fuel pressure on a 91 3.8 multi port? You might wanna double check those specs
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flgmtech1
User
Apr 16, 2009, 2:41 PM
Post #5 of 5
(1409 views)
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Re: 1991 Oldsmobile replaced gas line, no longer cranks.
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FUEL PRESSURE:
Ignition ON Engine OFF 40.5 to 47.0 psi With Regulator Vacuum Applied [1] 3.0 - 10.0 psi Less than Ignition ON Engine OFF
REMARKS:
[1] May be checked with either of the following methods.
- With Pressure Regulator Vacuum Line Attached at normal idle speed.
- Ignition ON Engine OFF with 10 Inches Of Vacuum Applied To The Pressure Regulator.
I stand corrected, I apologize. I am so used to so many of the newer models being in the 60 psi area I forget how mcuh lower the older models were!
Thanks for the call out!
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