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97 suzuki Sidekick p0171 and rough idle
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julius415
Novice
Oct 16, 2011, 2:24 PM
Post #1 of 10
(11101 views)
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97 suzuki Sidekick p0171 and rough idle
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Hey everybody didnt see any posts regarding my problem so here it goes.
I have a 1997 suzuki sidekick sport 1.8l with 108k. Some months ago the car started having a rough idle. When ever i came to a stop light the rpm would fluctuate up and down and the car would almost stall out. It progressively got worse and the car did start stalling when at a stop. During one of the rough idling episodes i decided to turn off the car, wait for the stop light to turn green, then turn it back on. But when i went to turn on the car, it wouldnt turn on, in fact not even the dash lights light up. So i called toyota service (they do suzuki's in hawaii), and had them check it out. Turns out during all the rough idling shaking a hose had come loose and spilled ( i think power steerin fluid) all over the alternator, which fried it and i ended up running the battery dry. They also told me my computer was fried. Had all of that replaced and the car turned on but still rough idle. They told to change maf, did and no change, then iac, did also and no change, then they had the nerve to tell me that the whole throttle body had to be changed. I argued they gave me the run around, so i jus paid and got out of there.
I went for a 2 month trip, and while i was gone my friends was using my car. Turns out a oil leak started and the engine ran with very low oil for a while. I came home it was running horribly. Took the engine apart saw that a couple of piston rings were broken and had scratched up the cylindes. Had machine shop hone cylinders, install oversize pistons, and check head. Got everything checked and ready and put it back together. Car is running alot better almost to full power, but now the rough idling returned.
I cleaned egr valve, checked for vacuum leaks the propane method didnt find any( first time doing it so i am not sure if i did a good job at it). But visually inspecting all hoses look good ( no cracks). There was a crack on exhaust manifold and i put thermosteel on it. Seems to be holding and i cant feel and hear any air coming out. I did notice that at first car runs great and no rough idling, but once it warms up the problems start. Also when i reset the ecm things get realy bad.
Any help would be greatly appreciated, i have been trying to figure this out on my own without going to costly mechanics. Also the ecm pulls up a p0171 code, and a p0420 code but i dont have a catalytic converter so it think that is why.
i checked the voltage for o2 sensor and had a constant reading below .45V, which in the haynes book says it is defective. but when i really gas the car i shoots up to .8V. So i am thinking it is not defective but i just get a constant reading below .45V because the mixture is lean. right? and therefore i am getting the p0171 code.
Also since no codes for any of the sensors are coming up it is safe to say that they are working?
anyways hope somebody can help thanks
Julius 
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Discretesignals
Ultimate Carjunky
/ Moderator
Oct 16, 2011, 4:42 PM
Post #2 of 10
(11053 views)
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Re: 97 suzuki Sidekick p0171 and rough idle
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What is the O2 sensor voltage when your cruising or off idle? Can you monitor fuel trim % with your scanner?
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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julius415
Novice
Oct 16, 2011, 4:53 PM
Post #3 of 10
(11047 views)
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Re: 97 suzuki Sidekick p0171 and rough idle
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i measured the o2 voltage with a digital multimeter, with car parked. When idling readings are .1V or below. Haynes repair book said to rev car and readings should fluctuate above and below .5V, but that doesnt happen it stays at .1-.3. But when i fully rev the car the reading shoot up to .8V. Through out the testing the car was rough idling. and i dont have a scanner to measure fuel trim.
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Discretesignals
Ultimate Carjunky
/ Moderator
Oct 16, 2011, 5:13 PM
Post #4 of 10
(11032 views)
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Re: 97 suzuki Sidekick p0171 and rough idle
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You check to see if your EGR valve was stuck open? That one has an electronic stepper motor EGR valve. The only way your going to be able to tell if it is open is to remove the valve and see if you can blow through it. If the EGR valve is recirculating exhaust gas at idle speeds, the engine will run rough and lean.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Oct 16, 2011, 5:14 PM)
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julius415
Novice
Oct 16, 2011, 5:57 PM
Post #5 of 10
(11023 views)
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Re: 97 suzuki Sidekick p0171 and rough idle
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i cleaned it out pretty good with carb cleaner. didnt try to blow through it though. will give that a try. any other suggestions ill get back to you in 20 min.
thanks
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julius415
Novice
Oct 16, 2011, 6:16 PM
Post #6 of 10
(11016 views)
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Re: 97 suzuki Sidekick p0171 and rough idle
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egr valve checks out. cant blow air through it
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Discretesignals
Ultimate Carjunky
/ Moderator
Oct 17, 2011, 5:32 PM
Post #7 of 10
(10994 views)
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Re: 97 suzuki Sidekick p0171 and rough idle
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There has to be some sort of vacuum leak going on. It must be a pretty good size one to cause the symptoms your experiencing. You may need to swing into a shop that has an EVAP smoke machine. The machine pressurizes the intake with smoky air. Any leaks will show up by the smoke.
How are your power brakes? The wrong PCV valve can also cause a lean symptom or surging. Pinch off vacuum lines including the PCV hose and brake booster hose to see if your idle surge goes away.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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julius415
Novice
Oct 17, 2011, 8:34 PM
Post #8 of 10
(10987 views)
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Re: 97 suzuki Sidekick p0171 and rough idle
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okay thanks ill try pinching the lines. and for the smoke machine i did some web search and found that some people used fog machines(halloween kind) so i think im gonna give that a try. alot cheaper than going to a shop. and brakes work fine except for some squeaking but thats a diff. issue lol
thanks again
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Jonas Brunz
New User
Nov 7, 2011, 9:01 AM
Post #9 of 10
(10916 views)
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Re: 97 suzuki Sidekick p0171 and rough idle
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Hello, I'm having the same issue on my 98 sidekick. Did you find what is causing this? Thanks! Jonas
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Nov 7, 2011, 9:35 AM
Post #10 of 10
(10922 views)
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Re: 97 suzuki Sidekick p0171 and rough idle
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Please start your own thread with your own specifics and not tag on someone else's,
T
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