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91 geo metro hesitation / bogging with throttle
Topic Started: Nov 26 2016, 10:38 PM (2,494 Views)
Jamez
New Member
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I know it's another hesitation bogging issue but I've searched every single thread possible with no clear answers so I'm posting my issue in hopes to some help ,

I have a 91 geo metro 3 cylinder engine with 5 speed transmission I recently replaced the head gasket , replaced the piston rings and the lifters and all other gaskets related to this procedure
The timing belt as well , it had this problem before the rebuild as well it would start and run fine
And idle fine I can rev it while in neutral and seems fine yet when I give it gas when attempting to drive it it hesitates with anything more than 1:4 throttle acts like it has no power and Boggs down
Yet if I feather the pedal barely it picks up and goes not normally but close to it , has new spark plugs as well the cap and rotor button too , stumped on this one , I don't see any arcing when dark testing the ignition components either , it does have a slight sputter at idle though I have not messed with the ignition timing at all ; so while trying to drive it and full throttle it bogs and bucks kinda surging I'm leaning towards fuel related issue , I'm stumped I've searched 13 different threads none with a clear answer , any help would be greatly helpful .
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1DCGUY
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Don't be a "Richard"

Jamez
Nov 26 2016, 10:38 PM
I know it's another hesitation bogging issue but I've searched every single thread possible with no clear answers so I'm posting my issue in hopes to some help ,

I have a 91 geo metro 3 cylinder engine with 5 speed transmission I recently replaced the head gasket , replaced the piston rings and the lifters and all other gaskets related to this procedure
The timing belt as well , it had this problem before the rebuild as well it would start and run fine
And idle fine I can rev it while in neutral and seems fine yet when I give it gas when attempting to drive it it hesitates with anything more than 1:4 throttle acts like it has no power and Boggs down
Yet if I feather the pedal barely it picks up and goes not normally but close to it , has new spark plugs as well the cap and rotor button too , stumped on this one , I don't see any arcing when dark testing the ignition components either , it does have a slight sputter at idle though I have not messed with the ignition timing at all ; so while trying to drive it and full throttle it bogs and bucks kinda surging I'm leaning towards fuel related issue , I'm stumped I've searched 13 different threads none with a clear answer , any help would be greatly helpful .
Have you checked your fuel pressure yet?
I've had this happen on my wife's first Metro, and it ended up being the fuel pump was bad.
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Jamez
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I have not yet tested fuel pressure but will do this asap and see if it is indeed fuel pressure related . I will post results as well, what gets me is it idles great and revs fine but go to drive it and it hesitates and bogs down . It does sputter just a tiny bit at idle .
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freegeo
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Jamez
Nov 26 2016, 10:54 PM
I have not yet tested fuel pressure but will do this asap and see if it is indeed fuel pressure related . I will post results as well, what gets me is it idles great and revs fine but go to drive it and it hesitates and bogs down . It does sputter just a tiny bit at idle .
Quote:
 
what gets me is it idles great and revs fine but go to drive it and it hesitates and bogs down .


You have to remember that when the engine is idling there is no load on it.

Check your fuel pressure and see if that checks out. With the key in the on position and the engine off, the fuel pressure should be between 23 and 31 psi. With the engine running at a idle it should be between 13 and 20 psi.

Since yours is a 91 does it have a vacuum advance distributor on it? Could be that the advance is not working as good as it used to.
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Jamez
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Yes it has the vacuum advance distributor , testing fuel pressure today ,
The fuel filter has been replaced I can eliminate that, I've read somewhere on here
That someone had kinda same issue his throttle body was leaking water into the gas
Somehow causing his issue , I also think previous owner moved the tps unit but not sure
Funny thing is if I bare give it gas it picks up but mid to heavy it falls on its face .
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1DCGUY
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Don't be a "Richard"

Jamez
Nov 27 2016, 10:28 AM
Funny thing is if I bare give it gas it picks up but mid to heavy it falls on its face .
This is exactly what my wife's car was doing before I replaced the fuel pump.
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Jamez
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Worth a shot but gonna test fuel pressure first just to get an idea if it is the pump or not
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1DCGUY
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Don't be a "Richard"

Jamez
Nov 27 2016, 10:47 AM
Worth a shot but gonna test fuel pressure first just to get an idea if it is the pump or not
Absolutely test first, no sense in replacing something that doesn't need replacing. :thumb
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Jamez
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Ok so I tested fuel pressure while running its at 12 barely 13 psi
Shut it off and turned key over it read 12 to 13 psi supposed to be 21 to 31
With the key on engine off does this indicated my pump is failing ?
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nwgeo


Looking to what you find here.... my 96 red rover 3/5 doing something very similar.
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Jamez
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To my indication the fuel pump is failing as it didn't meet the proper psi
Of 13 to 21 running and when engine off and key on it was 12 psi not between
21 to 31 , possible the fuel pump sock is clogged up but I'm sure the pump is
Definitely the cause here . Hoping for feed back from others .
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freegeo
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Jamez
Nov 27 2016, 12:52 PM
To my indication the fuel pump is failing as it didn't meet the proper psi
Of 13 to 21 running and when engine off and key on it was 12 psi not between
21 to 31 , possible the fuel pump sock is clogged up but I'm sure the pump is
Definitely the cause here . Hoping for feed back from others .
There is a procedure to check the fuel system if the fuel pressure is not right.
Just follow the procedure. Sounds like you have already done some of it. If you have any questions about it don't hesitate to ask.


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Jamez
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Thank you so much for this great information!
I'm gonna check the return line for blockage and
Retest . I'm gonna try the dead head method by
Clamping off the return line as well and see if pressure
Changes , I was only getting 12 psi running and 12 psi
Key on engine off . I see no leaks and the fuel filter is
New and not blocked . Thank you again for the info helps
Me further the diagnosis .
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ruckman101
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Hello, just joined because of fuel pump concerns with my '94 1.0 liter. I turn the key, and can hear it priming, for well over a year, then the tone changed, and it began bogging down under load. Now it doesn't fire, and there is no longer any sound of a fuel pump priming, much less, loud enough to hear continually as I go down the road.

My concern is I could be wrong, and the issue isn't as dire, more minor. An electrical glitch, clogged fuel filter, water condensation icing in the fuel lines restricting fuel flow.

I welcome all thoughts. And is there an access plate in the floor under the back seat so that I don't have to drop the gas tank?

Thanks.
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freegeo
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ruckman101
Dec 15 2016, 10:31 PM
Hello, just joined because of fuel pump concerns with my '94 1.0 liter. I turn the key, and can hear it priming, for well over a year, then the tone changed, and it began bogging down under load. Now it doesn't fire, and there is no longer any sound of a fuel pump priming, much less, loud enough to hear continually as I go down the road.

My concern is I could be wrong, and the issue isn't as dire, more minor. An electrical glitch, clogged fuel filter, water condensation icing in the fuel lines restricting fuel flow.

I welcome all thoughts. And is there an access plate in the floor under the back seat so that I don't have to drop the gas tank?

Thanks.
You should probably start your own thread. It would make it less confusing for you and others.
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