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Car starts but engine vibrates, when accelerates, car vibrates more, sounds like a miss, in drive, car creeps.

Tiny
JOH
  • MEMBER
  • 1990 SUZUKI SIDEKICK
Car starts, but idles rough and vibrates, press to accelerate, sometimes it revs, but when I put it in drive, no power, it goes very slow and vibrates and sounds like its missing.I took compression test, all 160 to 165 psi, all spark plugs firing, all fuel injectors working, I moved the distributor all the way left slowly, and all the way right slowly, I put in new spark plugs and took them back out twice, they were sooty black, clean them still sooty black, what should I try next? This really need some help. My friend says its the PCM (computer).
But I did not take it out. Also car has automatic transmission.
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Friday, December 30th, 2011 AT 11:30 PM

6 Replies

Tiny
RIVERMIKERAT
  • MECHANIC
  • 6,110 POSTS
See if there are any hard or soft codes. Is there any smoke from the tailpipe? Black soot is carbon buildup, usually either too much fuel or oil. Does it lose oil? Disconnect the oxygen sensor and see if any difference is made. Next, disconnect the mixture control solenoid (on the carburetor) and see if it makes any difference.
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Saturday, December 31st, 2011 AT 3:48 AM
Tiny
JOH
  • MEMBER
  • 11 POSTS
No codes, its a suzuki side kick, 1990, have injectors, already disconnected oxygen sensor, still behaves the same way, vacuum test is normal at 22 and steady, took out air filter, idles ok for now, but when I press the accelerator, no power, put it in drive, it creeps.
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Saturday, December 31st, 2011 AT 10:04 PM
Tiny
RIVERMIKERAT
  • MECHANIC
  • 6,110 POSTS
Throttle cable connected? Throttle butterfly opening?
Does the engine accelerate but there's no transfer of power to the wheels? Or will the engine not accelerate?
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Sunday, January 1st, 2012 AT 1:28 AM
Tiny
JOH
  • MEMBER
  • 11 POSTS
Yes cable is connected, butterfly open all the way, there is transfer of power to the wheels, but when I press on the gas pedal no power, just creeps.
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Sunday, January 8th, 2012 AT 8:52 PM
Tiny
RIVERMIKERAT
  • MECHANIC
  • 6,110 POSTS
Does the engine rev up? If so, the transmission is most likely slipping. Check the fluid level and condition. You want it red and not smelling like it's burned.
If not, you might have a plugged catalytic converter. Install a straight pipe in place of the converter and drive it. Power back? Replace the cat.
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Monday, January 9th, 2012 AT 8:18 AM
Tiny
RIVERMIKERAT
  • MECHANIC
  • 6,110 POSTS
Joh, did you get this transmission issue fixed? Do we need to keep looking into diagnostics?
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Tuesday, January 31st, 2012 AT 8:46 PM

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