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05-14-2011, 03:17 AM
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#1 |
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Stock
Join Date: Apr 2011
Location: Washington D.C.
Posts: 6
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Engine Stumbles when accelerating
1986 Automatic
I'm trying to figure out what is causing my engine to stumble. I have already replaced spark plugs, rotor, distributor cap, wires. No codes are coming up, TPS, coil are both good. Cleaned throttle body. I'll just describe how I have been able to recreate the problem: I'll start the engine (hot or cold), then floor it until I get to about 30 mph (engine runs fine during this part) and then I let off accelerator. Anytime I try to accelerate after that, the engine stumbles and the idle speed is erratic, even stalls sometimes if stopped at a light. Any help is greatly appreciated! Thank you! |
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05-14-2011, 07:20 AM
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#2 |
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12psi boost
Join Date: Jun 2010
Location: California
Posts: 277
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might have water in the plug well,
or maf sensor i belive can cause this if its dirty.. anyone correct me if im wrong lol
__________________
1987 supra, BLUE 7mge.. AUTO TO MANUAL SWAP.. i really want turbo 
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05-14-2011, 05:55 PM
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#3 |
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Lexus & 550's
Join Date: May 2010
Location: Baltimore
Posts: 526
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Check for air/vacuum leaks
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05-14-2011, 07:28 PM
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#4 | |
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Stock
Join Date: Apr 2011
Location: Washington D.C.
Posts: 6
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Quote:
I forgot to mention that I checked all hoses for leaks. As far as I can tell they are all good. And I had a mechanic verify that they were They are very small stumbles most of the time. Almost like little 'hiccups' of the engine cutting out. When it is really bad then it will actually cause it to shift late and hard in addition to the stumbles. The RPMs will just go up to about 4k or 5k before it shifts. New transmission installed about 3 months ago, this problem has occurred before and after the transmission was replaced Last edited by Spartacus; 05-14-2011 at 07:45 PM. |
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05-14-2011, 10:28 PM
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#5 |
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Lexus & 550's
Join Date: May 2010
Location: Baltimore
Posts: 526
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Does it happen more when cold or hot
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05-14-2011, 11:13 PM
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#6 | |
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Stock
Join Date: Apr 2011
Location: Washington D.C.
Posts: 6
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Quote:
I just read this thing about a problem for supras being the speed sensor and the solder points attached to the odometer. Something about it not sending the correct signals to the ecu. Does that make sense? |
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| Tags |
| engine, hesitation, idle, stall, stumble |
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