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post #1 of (permalink) Old 12-11-2003, 12:47 PM
auminer
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Learned How To Spell SamUrai and Have a ?

OK, I ended up buying the 87 Samurai for $490 in the Bay Area. Test drove it on the streets before buying it and it seemed to run fine. Started to head back up north with it and found it would not go over 45-50mph on the freeway. At those speeds it flattened out and started to sputter when I tried to give it more gas. The more gas I tried to give it the worse it got and never could get it to go over 50 tops. I went to a friends house and adjusted the valves, replaced the plugs, wires, cap, rotor, PCV, fuel and air filters. Still no change. I did do a search here on "no power" and "power" going back 3 months and did not come up with much help. Not sure if the 02 sensor would do that or not and not sure how to check the sensor out. I'd hate to start replacing things that are working. If anyone could inform me of what the fix may be (if there is one) or what might possibly be causing the problem I would appreciate it.
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post #2 of (permalink) Old 12-11-2003, 01:08 PM
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Re: Learned How To Spell SamUrai and Have a ?

Check to see if the catalytic converter is clogged. Other than that it could be the carb. Jim
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post #3 of (permalink) Old 12-11-2003, 01:34 PM
 
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Re: Learned How To Spell SamUrai and Have a ?

What gas are you running? I'm having the best luck with U76 gasahol. You can start by putting in some
alcohol based gas line antifreeze.

Also check the grounds from the fire wall to the bat neg post and the dist, either of thes being bad will
cause a ground loop that the computer can't deal with.

Is the coil stock? if so they are notorious for going half bad. Bad enough to do what yours is doing, but
not bad enough to die.

Is it better, worse or the same, when cold?
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post #4 of (permalink) Old 12-11-2003, 02:34 PM
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Re: Learned How To Spell SamUrai and Have a ?

The converter is welded on so I can't disconnect it to see if that's the problem. As for the gas, it's whatever was in the tank when I bought it. I'll fill it up (1/2 tank) and see what happens. Yes, it does appear that it has the original coil so I'm off to get a new one and try that. The grounds look good, but I'll get some new heavy duty ground straps while at the parts store as well. If all else fails I'll spend the $150 on a new converter tomorrow [img]images/graemlins/frown.gif[/img] Thanks for your replies! Hope to be posting soon with the fix [img]images/graemlins/grin.gif[/img]
Oh yea, it doesn't seem to matter if it's cold or warmed up. The only thing that affects it is the gas pedal once it reaches 40+mph.
post #5 of (permalink) Old 12-11-2003, 03:08 PM
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Re: Learned How To Spell SamUrai and Have a ?

One thing I would suggest. Sounds like the problem I had with my 87 when I got it. It did like to rev past 4500 when you put the gas to it. Bad gas mileage and did want to go over 50 mph. I went thru everthing that you have but for the converter(didn't have one on it). Found out that when the engine was rebuilted that they missed a tooth on the timing belt. They had it one tooth advanced. After setting it back right and setting the timing of the dist back right, took care of all my problems. Worth a try, dont cost anything to look at that.
Steve
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post #6 of (permalink) Old 12-11-2003, 05:50 PM
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Re: Learned How To Spell SamUrai and Have a ?

Its the carb vent tube thing. I can almost guarantee ya.

Here's a link to Petroworks site where you can get the little tube. There is also a picture showing you where it goes so you can look down into your carb to make sure you dont already have it.

When I got my 88 samurai it did exactly the same thing you are describing. In fact the guy I got it ffrom got rid of it because it "wasn't a highway vehicle" and "wouldn't go over 50." I got the little vent tube, tapped the sucker in and magically that flat spot disappeared.

All that other stuff you did was good, but I bet the vent tube (which was acknowledged in a tech service bulletin through suzuki) is the problem.

search the BBS for 'vent tube' and you will get lots of posts about it.

~daxe

PS Here is a link to an article on this website about the tech bulletin.
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post #7 of (permalink) Old 12-12-2003, 12:40 PM
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Re: Learned How To Spell SamUrai and Have a ?

Thanks for the all the info guys! I did order the vent tube and it should be here in 3-4 days. Replaced the coil as it looked like the original, but the problem still exists. Thanks daxe for the links! Sure sounds like it may be the fix. I'll let you know once I get the tube and install it. While I'm waiting for the part I'll check the timing belt and might as well just replace it. Thanks again to all of you for the info!

Stan
post #8 of (permalink) Old 12-12-2003, 03:06 PM
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Re: Learned How To Spell SamUrai and Have a ?

If the vent tube does not do it go ahead and try a bosch o2 sensor. I had to change mine when it was running like yours. Might also check the timing. JCC
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post #9 of (permalink) Old 12-16-2003, 03:49 PM
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Re: Learned How To Spell SamUrai and Have a ?

Well, I got the vent tube today and installed it. Same problem exists [img]images/graemlins/frown.gif[/img] I did check vaccum at idle and again at 1500-2000rpm and there was a drop from 17 to 10 which I take to infer a restriction in the exhaust system (converter). One other problem that I noticed was that it sure does seem to run rich until I take it on the road for couple miles. Smell, drips black from the exhaust pipe, etc. It does disappear once it's been driven though. I checked the choke and it is working properly. Also, there is a tear in the rubber boot over the accelerator pump? on the passenger side of the carb. Still waiting for the FSM to get here so I'm at a loss on the Hitachi carb. Cam timing checks out OK also. Guess the next step is to replace the $150 converter [img]images/graemlins/mad.gif[/img] Would hate to fry a new converter due to raw gas in the exhaust though. Have yet to check the O2 sensor...friend doesn't have a meter.

Thanks to everyone for the help and I'll let you know what the fix was once I find it.
post #10 of (permalink) Old 12-16-2003, 06:32 PM
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Re: Learned How To Spell SamUrai and Have a ?

Hey, everyone! can you guess what I am about to suggest??? [img]images/graemlins/grin.gif[/img]

Check dipstick. Is the oil exceptionally runny?

Check the fuel pump (passenger side rear end of the head). Is the pipe without a hose on it "wet" looking?

Does the engine sound a bit loud mechanically?

Yes to any of these means a blown fuel pump diaphragm. Which is VERY BAD!

Drain the oil. If it is very thin and smeels of gasoline, you need at the very least, to replace the fuel pump ASAP!

There is a possibility that the engine is on it's way to blowing up if this situation existed for any time.

I hope that it is any of the other problems suggested...

Oh, and you might go through and replace all the vaccuum hoses on the hitachi carb. Simply cut and replace them one-by-one. This helped mine run beter...
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