1999 GL1500SE Bad Low End Performance and Surge


Information and questions on GL1500 Goldwings (1988-2000)
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RockportDave
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Motorcycle: 1999 GL1500 SE

1999 GL1500SE Bad Low End Performance and Surge

Post by RockportDave » Mon May 07, 2018 11:57 am



This bike has only 36,xxx miles and took 3/4 tank of gas to get it 50 miles to home after I bought it. Changed timing belts, fuel filter, overhauled carbs with Randakk kits. Set the air screws out 2 rounds ( they have slots in them from someone, but I haven’t been able to get a screw driver to them to adjust) and adjusted floats to 8mm. Have great top end power, but surges about every 8 seconds while idling, low end surges from idle to about 2500-3000 rpm. Fuel mileage about 25-30. Typical 1500 faults.
Decided to check all ECM connections. Good readings on all coils, pulse, side stand switch, gear position, etc. checked the IAT cold and 2-3 k ohms. Checked the coolant temp sensor cold 2-3 k ohms. Ran the engine up to about 1/4 gauge before fans came on and have 207 ohms. Ran it until the fans came on and down to 167 ohms. Let it cool down and when the gauge read about 1/4 had 197 ohms.as it cooled down the readings came up. At the thin line on the gauge it read 275. At the thick line on gauge it read 335.
Is the sensor supposed to read less the warmer the engine gets? I don’t have a way to read actual temps and the manual says it should read between 200-400 ohms at 175 degrees.
I have a new sensor coming and will check it in water with a thermometer before I install it to see what it reads.
Any suggestions, comments or guidance are welcome.
Thanks,
Dave


1999 GL1500SE 5th Goldwing through the years

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RockportDave
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Re: 1999 GL1500SE Bad Low End Performance and Surge

Post by RockportDave » Mon May 07, 2018 3:28 pm

Guess it took a while to sink in, but I realized the cold reading is 2,000-3,000 ohms (2-3 k ohms) and the sensor will read lower as the temperature rises. I believe the sensor is working.
I will continue to troubleshoot the surge problem.
Dave
1999 GL1500SE 5th Goldwing through the years

TwoTone Trike
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Re: 1999 GL1500SE Bad Low End Performance and Surge

Post by TwoTone Trike » Mon May 07, 2018 5:19 pm

Hey Dave, Have you checked for vacuum leaks? They can cause an engine to surge. Hope this helps. Tony.

DaveO430
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Re: 1999 GL1500SE Bad Low End Performance and Surge

Post by DaveO430 » Mon May 07, 2018 7:12 pm

I wonder what effect the air jet solenoids have and what would happen if they were not working or if they were connected wrong. I don't remember ever reading any posts concerning a problem with them.

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bellboy40
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Re: 1999 GL1500SE Bad Low End Performance and Surge

Post by bellboy40 » Mon May 07, 2018 7:37 pm

Did you check all the vacuum lines while you had the carbs out? There are a few more under that mat that is under the carbs. One of them has a 90° bend in it that is notorious for having a leak at the bend. A vacuum leak will definitely cause it to surge while idling.

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ct1500
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Re: 1999 GL1500SE Bad Low End Performance and Surge

Post by ct1500 » Mon May 07, 2018 8:06 pm

Engine surging can usually be traced to a lean mixture due to carb problems or vacuum leaks which messes with the ECM. Way out of whack sync will also cause problems and is usually due to someone adjusting it so it will somewhat run albeit poorly.
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RockportDave
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Re: 1999 GL1500SE Bad Low End Performance and Surge

Post by RockportDave » Mon May 07, 2018 8:19 pm

I sync’d the carbs after I got it back running. I haven’t been able to adjust the idle air on the carbs. Someone has already removed the stops and ground a groove on them for a flathead screwdriver. I checked them before I removed them and they were both at 2 turns out. I reinstalled them at 2 turns out during overhaul.
It sounds and runs like it has a vacuum leak, just haven’t located it yet.
Thanks,
Dave
1999 GL1500SE 5th Goldwing through the years

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RockportDave
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Re: 1999 GL1500SE Bad Low End Performance and Surge

Post by RockportDave » Mon May 07, 2018 8:27 pm


Here is the notorious 90 deg vacuum line. Seems there would be more as bad as this one is.
Here is the notorious 90 deg vacuum line. Seems there would be more as bad as this one is.

1999 GL1500SE 5th Goldwing through the years

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RockportDave
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Re: 1999 GL1500SE Bad Low End Performance and Surge

Post by RockportDave » Mon May 07, 2018 8:42 pm

CT1500,
Have you experienced any problems with the PAIR check valves sucking air?
My next rotation off from work I plan to check all the air systems in order per the manual. Didn’t have time today, but did get through the ECM ohms and voltage checks. Wanted to rule out any bad sensors and switches. Everything checked out.
I may have to take a week or two of vacation to get it going. The wife and I did make a 170 mile run yesterday. Other than getting fuel quite often, everything went well.
Dave
1999 GL1500SE 5th Goldwing through the years

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RockportDave
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Re: 1999 GL1500SE Bad Low End Performance and Surge

Post by RockportDave » Wed May 09, 2018 8:52 pm

I bit the bullet and ordered new slow jets, main jets, orings, jet holders, carb boots (insulators), sub air filter, cruise filter and a couple other items for the bike. I have had the carbs apart twice and don’t like the way the jets and jet holders look and fit. Figured I might as well replace the boots while there. I will do a complete tear down and boil the carbs to be sure they are clean.
I will be testing the complete induction system and replacing any vacuum lines that look or feel suspicious.
Watched a Honda training video on the induction system and now understand how it works.
I don’t mind spending the time and money as long as the bike runs right and I trust it on long trips.
As always, any suggestions are appreciated.
Dave
1999 GL1500SE 5th Goldwing through the years

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RockportDave
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Re: 1999 GL1500SE Bad Low End Performance and Surge

Post by RockportDave » Wed May 16, 2018 9:05 pm

Bought Honda parts and got most in, still waiting on 1 jet holder that was on back order. New orings and carb gaskets including needle seat gasket for both carbs were $40, which is very reasonable. With low speed jets, main jets, jet holders, air adjustment screws with the spring, washer and oring, sub filter, cruise filter, rubber heat shield, carb insulators (boots) and air cleaner tube joint with screws totaled to $235 including shipping. Small price to pay to get this beast to purr like a kitten.
I took the vacuum hose diagram And blew up to 11”x17”, color coded all lines and plan to check every one of them before the carbs go back on.
May be able to get her running this weekend between all other chores.
Dave
1999 GL1500SE 5th Goldwing through the years

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Stew
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Re: 1999 GL1500SE Bad Low End Performance and Surge

Post by Stew » Wed May 16, 2018 10:21 pm

Take some good pictures and let us know how it goes.
Winging it every chance I get 8-)

19,119 miles when I got it from dad Oct 15, 2017 --- 21,792 miles and counting as of May 25, 2018!

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RockportDave
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Re: 1999 GL1500SE Bad Low End Performance and Surge

Post by RockportDave » Thu May 17, 2018 7:54 am

Will do Stew.
Thanks,
Dave
1999 GL1500SE 5th Goldwing through the years

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Re: 1999 GL1500SE Bad Low End Performance and Surge

Post by RockportDave » Thu May 17, 2018 8:46 pm

Got the carbs off again and one is soaking in Berrymans. Glad I got the new parts. The low speed jet on #2 carb fell apart while removing it. Here are some pics with what is left of the rubber heat shield, and the broken low speed jet. Also, the broken air cleaner tube joint.
Dave












1999 GL1500SE 5th Goldwing through the years

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RockportDave
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Re: 1999 GL1500SE Bad Low End Performance and Surge

Post by RockportDave » Thu May 17, 2018 11:34 pm

Carbs after 1 hour in Berrymans 0996 Chem Dip. Rinsed well with water hose, blew through all ports with compressed air and sprayed well with Berrymans B12. Berrymans did a pretty good job.




1999 GL1500SE 5th Goldwing through the years

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Stew
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Re: 1999 GL1500SE Bad Low End Performance and Surge

Post by Stew » Thu May 17, 2018 11:53 pm

Those look pretty good. A few years back I figured my old can of chem-dip was needing to be replaced so I went and bought another only to discover it was their new water based formula which is very different than the old acid based formula (I think that was the difference.) I just went into my garage and double checked that the new can I bought is the 0996 like you mentioned and it is. Maybe I'll dust it off and give it a chance now.
Winging it every chance I get 8-)

19,119 miles when I got it from dad Oct 15, 2017 --- 21,792 miles and counting as of May 25, 2018!

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RockportDave
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Re: 1999 GL1500SE Bad Low End Performance and Surge

Post by RockportDave » Fri May 18, 2018 10:31 am

The directions call for 15-30 minutes. Says they can soak overnight, but not over 4 hours!?! I sleep more than 4 hours.
I am more concerned with getting the small passages open than the external looks of the carbs.
I should have them back together today if the back ordered jet holder arrives today.
Dave
1999 GL1500SE 5th Goldwing through the years

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Re: 1999 GL1500SE Bad Low End Performance and Surge

Post by RockportDave » Fri May 18, 2018 3:17 pm

I made a float gauge from thin cardboard. Just be sure the ends are straight and square to each other.
Also, I changed the sub filter and cruise filter. They disintegrated when I touched them.
I am waiting on the other jet holder that was back ordered. Supposed to be delivered today by USPS...we’ll see.
While waiting, I will be checking each vacuum line per the vacuum chart, installing the new rubber heat shield and carb insulators.








1999 GL1500SE 5th Goldwing through the years

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RockportDave
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Re: 1999 GL1500SE Bad Low End Performance and Surge

Post by RockportDave » Fri May 18, 2018 10:10 pm

The other jet holder made it in, got everything back together and she sounds good. No surge and smothe through all gears and RPMs.
The wife and I took a short 15 mile ride to town for gas and it feels like a 1500 should feel.
Gotta sync the carbs and set the air needles. My choke cable is binding when I turn sharp right and applying choke and cruise is not working. I’ll fix all tomorrow.
Dave




1999 GL1500SE 5th Goldwing through the years

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RockportDave
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Re: 1999 GL1500SE Bad Low End Performance and Surge

Post by RockportDave » Sun May 20, 2018 10:34 pm

Everything fixed and about 150 miles on it. Runs smooth with no hesitation or surge. Well worth the time and money spent.
Now on to bleeding the brakes...
Thanks to all for the help.
Dave


1999 GL1500SE 5th Goldwing through the years

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