Hesitation and Sputtering - Page 4 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1987-1991 Parley with regards to your 1987 to 1991 Bonneville, Olds 88 or Buick Le Sabre Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 08-05-2005, 03:32 PM   #31
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Quote:
Originally Posted by jwikoff99
What is it you can spray around gaskets while the engine is idling? If there is a leak in the gasket, the idle will change. Is it ether, or something else?
If your checking for a vacuum leak you can use a bottle of propane with a rubber hose or carb cleaner,and spray around the intake, throttle body, hoses etc.
I don't believe this is a vacuum problem since the symtoms are more severe.


Thanks

Frank
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Old 08-05-2005, 04:50 PM   #32
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I don't personally think that it'* a vacuum leak. I've seen cars that had such a vacuum leak that the IAC couldn't keep the idle below 1500 rpm, and they still ran fine at whatever load and throttle were presented to them.

What about the TPS? Any thoughts on that one? I figure that if the computer doesn't know that you're opening up the TB, it doesn't know to add fuel... Just a thought, and an easy one to test since he'* got the haynes and multimeter. I think that'* all he needs to test that theory, but my haynes is in the garage, and I have to go to work now.

Good luck.
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Old 08-05-2005, 05:09 PM   #33
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What about the TPS? Any thoughts on that one? I figure that if the computer doesn't know that you're opening up the TB, it doesn't know to add fuel... Just a thought, and an easy one to test since he'* got the haynes and multimeter. I think that'* all he needs to test that theory, but my haynes is in the garage, and I have to go to work now.

Are you refering to the Throttle Positioning *witch, theJMFC, if so I believe I know where that'* located, if not I can always check the manual. Another question............how do you check it with a multimeter, I have more than one multimeter but don't know quite how to use them.....Sorry!


Frank
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Old 08-05-2005, 05:19 PM   #34
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You test for voltage with the key on, engine off. You want ~.46 volts at 0% throttle and ~4.6 at 100%. You can harpoon the wires to the connector, I think B and C, but don't quote me on that.

This stuff might be in techinfo.
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Old 08-06-2005, 02:34 AM   #35
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Yes, the Throttle Position Sensor... Let me run out and get that manual...

*a short time passes*

Let me see what it says...

*a whole lot of time passes...*

You know, the index/table of contents really sucks on these Haynes manuals.

*a bit more time passes......*

Well. It tells me how to take it off, and how to put it back on. That'* about as helpful as, well, nothing.

I did do some searching and digging though, and it looks like jwikoff99 is right, that is the voltage range that you're looking for. Just set the multimeter for that volt range in DC, and start trying wires on that connector. One wire (from what I read) is a power wire, and should have a constant 5v.

EDIT: I got bored and went into the garage and started probing things. My probes are a little on the thick side, so I had trouble making and keeping good contact, but I managed. What worked for me was probing the middle ("b" I assume) terminal, while holding the other probe to a body ground (the exhaust crossover heatshield worked just fine for me). I had .42 v at idle, and around 4.15 at WOT. Just a bit low, but nothing to worry about.

Give it a try. It'* fun. All the cool people do it.
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Old 08-06-2005, 04:12 PM   #36
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I think I probed the middle and the right wires.
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Old 08-07-2005, 05:09 PM   #37
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YA HOO!!!!!
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Old 08-07-2005, 05:10 PM   #38
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Quote:
Originally Posted by Maymybonneliveforever
YA HOO!!!!!
So... did ya fix it?
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Old 08-07-2005, 05:21 PM   #39
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If you check my last post, I'm so happy to tell you all that the problem is not only fixed but runs better than is has in a long time.
To make a long story short I sprayed the engine with degreaser, then power washer it. I then sprayed a whole can of Throttle Body Cleaner into the TB while the engine was reving. I didn't stop until the whole can was finished.
Conclusions:
1. I believe that the engine cleaner solved the hesitation and sputtering problem, although the engine was quite clean beforehand. ( I've power washed the engine ever year since new).
2. I believe that the TB cleaner helped give me approximately 20 to 25% more power than I had in a long time.
3. If this same problem should come back, then I would have to say it was an electrical problem rather than fuel pump related. Hey just a thought.

I was so happy that I got up early this morning just to make sure it wasn't a dream, and also cause I enjoy driving my Bonne again.

If you didn't hear me before then i'll say it again.

Ya Hooooo!


For those of you who took the time to answer my posts and those of you that stuck with me through this frustrating engine problem, I owe you a drink or two. I hope one day you can take me up on that.

Frank
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Old 08-07-2005, 07:08 PM   #40
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I'm suprised that that fixed it, but glad. Hope it stays away.
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