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1998 chevy malibu


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buddy56
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Jan 4, 2013, 8:58 PM

Post #1 of 23 (1376 views)
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1998 chevy malibu Sign In

hi i am hoping someone can help me. i have a 98 chevy malibu 3.1l with 168000 miles. the problem is it idles very rough. i replaced the lower intake gasket because of the coolant leak, did a tune up(fuel filter, plugs, wires, pcv valve, air filter, oil change every 3000 miles, and all other maintenance. i sprayed carb cleaner around the intake but didnt find any leaks. what else should i check.thanks for your help.


Sidom
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Jan 4, 2013, 9:45 PM

Post #2 of 23 (1353 views)
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Is the check engine light on Buddy?....If it is, pull the codes and post them here

How was it running before the gasket replacement?


Also double check your firing order






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(This post was edited by Sidom on Jan 4, 2013, 9:46 PM)


Hammer Time
Ultimate Carjunky / Moderator


Jan 4, 2013, 9:45 PM

Post #3 of 23 (1350 views)
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Have the computer scanned to see if there are any stored codes in there.




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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



buddy56
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Jan 4, 2013, 9:47 PM

Post #4 of 23 (1341 views)
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thanks guys for such a quick reply. no there are no codes. i had a code for a cyl 3 misfire but that was cause of a loose plug wire. it ran about the same before the gasket replacement. i replaced it cause it was leaking coolant.


buddy56
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Jan 4, 2013, 9:49 PM

Post #5 of 23 (1332 views)
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the firing order is not adjustable. i have a waste spark system. all the plugs were gapped (checked) before installation. and the wires were replace one by one to avoid mixing them up.


(This post was edited by buddy56 on Jan 4, 2013, 9:50 PM)


Hammer Time
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Jan 4, 2013, 10:09 PM

Post #6 of 23 (1321 views)
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Of course the firing order can be wrong.
Here's the order it should be in.







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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



buddy56
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Jan 7, 2013, 7:26 PM

Post #7 of 23 (1273 views)
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sorry for the late reply. i did the tune up myself and i did not mix up any wires. i took them off one a a time and did the plug and wire at the same time.


Discretesignals
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Jan 7, 2013, 8:29 PM

Post #8 of 23 (1267 views)
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Does it only idle rough? How does the engine run at higher rpms? Are you getting any trouble codes now?





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.


buddy56
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Jan 7, 2013, 9:12 PM

Post #9 of 23 (1261 views)
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yes. all it does is idle rough. on the highway it runs good. it revs good and there are no check engine lights. i have a code for the trans range sensor but it doesnt set off the light. i doubt that would cause this issue.


Discretesignals
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Jan 7, 2013, 9:25 PM

Post #10 of 23 (1260 views)
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Does your scanner have the ability to monitor data stream information?

Did you reuse the EGR gasket? Check to make sure the EGR gasket is causing a leak and the EGR gasket isn't on backwards. Don't spray carb cleaner around the EGR valve, it will ignite.

Also make sure that your EVAP purge solenoid vacuum line and line to the canister is plugged in





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 Jan 7, 2013, 10:02 PM)


Sidom
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Jan 7, 2013, 11:38 PM

Post #11 of 23 (1247 views)
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That's kinda odd there is no codes being set....

If this problem is just at idle & when in drive sitting,, you may want to take a quick look at the motor mounts.........Jack up the engine with a jack & block of wood, just enough to get the weight off the mounts, and see if it does anything for your problem.






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(This post was edited by Sidom on Jan 7, 2013, 11:39 PM)


buddy56
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Jan 8, 2013, 6:14 PM

Post #12 of 23 (1195 views)
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thanks i will try those suggestions. yes i have a autel scanner and it is able to show live data. i was told by a more experienced tech (bmw foreman) that it could be the mounts. i think its rough in neutral and park. but its really bad in gear. i could see the mirrors shaking. also i did have an issue with the egr valve. can it be cleaned.


Discretesignals
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Jan 9, 2013, 7:58 AM

Post #13 of 23 (1187 views)
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What is the issue with the EGR valve? Most techs can tell the difference between an engine vibration from motor mounts and a vibration from misfiring, so Sid and your tech is probably pointing you in the right direction.





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.


buddy56
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Jan 9, 2013, 6:00 PM

Post #14 of 23 (1167 views)
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well i spoke to two different techs. one tech used the TECH 2 scanner and we saw that the egr valve was open a bit at idle. so we tried to free it up by using the scanner to open and close the valve. also i sprayed carb cleaner in it and let it sit to loosen the carbon. (is that a good way to clean it?) then the bmw tech did not look at the car. i spoke to him and he said it could be a mount since it was happening when it is in gear. i dont feel anything in park but im not too sure if it is rough in park also. but in drive its kinda bad. i feel it in the seat and steering wheel and i also see the side mirrors shaking.


Hammer Time
Ultimate Carjunky / Moderator


Jan 9, 2013, 6:04 PM

Post #15 of 23 (1163 views)
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An EGR valve not closing is a problem and that has to be resolved. If it won't seat on it's own, then you will have to replace it.




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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



buddy56
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Jan 9, 2013, 9:16 PM

Post #16 of 23 (1147 views)
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it was not staying open fully. it was only open a little. can it be cleaned?


Hammer Time
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Jan 9, 2013, 9:19 PM

Post #17 of 23 (1142 views)
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A little open at idle is a problem. Cleaning likely won't work. You can't access the inside at all. It should be replaced. If the engine has a lot of carbon, it could happen again if a loose piece of carbon gets caught in it.




~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



buddy56
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Jan 9, 2013, 9:34 PM

Post #18 of 23 (1133 views)
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so how would i be able to clean the carbon inside the engine?


Hammer Time
Ultimate Carjunky / Moderator


Jan 9, 2013, 9:37 PM

Post #19 of 23 (1128 views)
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Many shops offer an Induction system service that will breakup the carbon.




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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



buddy56
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Jan 9, 2013, 9:38 PM

Post #20 of 23 (1122 views)
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is that the cleaning that uses the walnut shells?


Hammer Time
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Jan 9, 2013, 9:48 PM

Post #21 of 23 (1118 views)
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I have no idea what that is.




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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



buddy56
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Jan 9, 2013, 9:50 PM

Post #22 of 23 (1113 views)
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there was a cleaning where crushed walnuts is used to clean carbon.


Sidom
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Jan 9, 2013, 10:14 PM

Post #23 of 23 (1108 views)
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You put crushed walnuts inside the intake & then squirrels go inside the intake to get the nuts & their tails remove all the carbon from the intake........




There is also a method that is like sand blasting but instead of using sand or glas$ beads.....it uses crushed walnut shells....






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(This post was edited by Sidom on Jan 9, 2013, 10:15 PM)




1998 chevy malibu




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