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Limp mode 99ss lxi


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Hi all, 
My '99 sunsetter lxi seemed to be on limp mode last night. I wouldn't go over 3,000 rpm in gear, but when I reved the engine out of gear I got more rpms out of the engine. 
I read a few posts about limp mode but not quite sure where to start. I just filled it up with fresh supreme fuel. Never had this issue before. Thanks for for the help!

Edited by pmm009
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1 hour ago, pmm009 said:

Hi all, 
My '99 sunsetter lxi seemed to be on limp mode last night. I wouldn't go over 2,000 rpm in gear, but when I reved the engine out of gear I got more rpms out of the engine. 
I read a few posts about limp mode but not quite sure where to start. I just filled it up with fresh supreme fuel. Never had this issue before. Thanks for for the help!

I could be wrong, but I don't think any 1999 engine has a limp mode.

What engine do you have?  Diagnosis will depend on a few details.

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2 hours ago, justgary said:

I could be wrong, but I don't think any 1999 engine has a limp mode.

What engine do you have?  Diagnosis will depend on a few details.

Indmar 325 5.7L

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50 minutes ago, pmm009 said:

Indmar 325 5.7L

Multi port injected?  First do a full tune up if you haven't done one in a while.

Next, test the fuel pressure at key on, idle, and wide open throttle.  They should all be the same ~42-44 PSI.

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BlindSquirrel
4 hours ago, justgary said:

I could be wrong, but I don't think any 1999 engine has a limp mode.

 

My 1998 went into what I believe was limp mode, once, when it was over heating because of an impeller failure. I don't remember the RPM limit, but it was well under 3,000. Wife was driving and didn't notice the temp gauge or check engine light. Went to take off from a very long no wake zone, and it didn't want to go much over 10mph or so. 

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3 minutes ago, BlindSquirrel said:

My 1998 went into what I believe was limp mode, once, when it was over heating because of an impeller failure. I don't remember the RPM limit, but it was well under 3,000. Wife was driving and didn't notice the temp gauge or check engine light. Went to take off from a very long no wake zone, and it didn't want to go much over 10mph or so. 

You could be right about that one, or maybe the pistons just fit too tight when it got hot.

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20 hours ago, justgary said:

Multi port injected?  First do a full tune up if you haven't done one in a while.

Next, test the fuel pressure at key on, idle, and wide open throttle.  They should all be the same ~42-44 PSI.

It's the EFI engine. I've noticed when I "key on" that the gauges have more trouble coming to life. They are slow to light up, maybe a symptom of low fuel pressure? 

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On 7/18/2021 at 10:30 AM, justgary said:

I could be wrong, but I don't think any 1999 engine has a limp mode.

What engine do you have?  Diagnosis will depend on a few details.

22 hours ago, pmm009 said:

Indmar 325 5.7L

The owner's manual refers to it as "power reduction mode." 

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20 minutes ago, pmm009 said:

It's the EFI engine. I've noticed when I "key on" that the gauges have more trouble coming to life. They are slow to light up, maybe a symptom of low fuel pressure? 

Slow dash gauges are independent of fuel pressure. 

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22 hours ago, justgary said:

test the fuel pressure at key on, idle, and wide open throttle.  They should all be the same ~42-44 PSI.

How are those fuel pressures looking?

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1 hour ago, xav8rdtc said:

How are those fuel pressures looking?

It's going to have to wait until next weekend when I am back at the cottage. I am planning on testing the fuel pressure, should I also try testing the oil pressure? Or is there another test I should do to help narrow down the problem? 

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3 hours ago, pmm009 said:

It's the EFI engine. I've noticed when I "key on" that the gauges have more trouble coming to life. They are slow to light up, maybe a symptom of low fuel pressure? 

More like low voltage to the dash.  What is your indicated voltage?  What did the engine temp look like when this happened?  No beeping from the dash?

Definitely check your fuel pressure but if it hasn't been done lately I'd change the following as part of a normal tune up and preventive maintenance:

  • Spark plugs (should be done every 2-3 years)
  • Cap & rotor (get the marine version)
  • Spark plug wires (they change resistance when they age)
  • Coil (older units can soft or hard fail when it gets hot)
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7 hours ago, pmm009 said:

It's the EFI engine. I've noticed when I "key on" that the gauges have more trouble coming to life. They are slow to light up, maybe a symptom of low fuel pressure? 

The gauges will rattle around for about a second or two to calibrate themselves when they power up.  If that is what you are seeing, it is normal.  Otherwise, clean all of your power connections.

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22 hours ago, formulaben said:

More like low voltage to the dash.  What is your indicated voltage?  What did the engine temp look like when this happened?  No beeping from the dash?

Definitely check your fuel pressure but if it hasn't been done lately I'd change the following as part of a normal tune up and preventive maintenance:

  • Spark plugs (should be done every 2-3 years)
  • Cap & rotor (get the marine version)
  • Spark plug wires (they change resistance when they age)
  • Coil (older units can soft or hard fail when it gets hot)

I left my blower on for a few hours which probably weakened the battery. Do you think there is a correlation with the weak battery and limp mode? 

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