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#3220933 - 12/18/13 06:28 PM slight miss at idle
ram_man Offline


Registered: 03/15/13
Posts: 2853
Loc: southern mo
Ive been getting inconsistent fuel mileage in the saturn and exhaust pop at idle fairly often was tuned up 2000 miles ago. Wires tested good, coils are good, no cel. Intake gasket and vac lines are good. O2 sensor seems to be switching pretty good. I cleaned the throttle body no change. Spark plugs looks good to. Egr is clean to. I drive the same route everyday and last time I got 36mpg this time 31..... same station and pump to. What else toncheck


Edited by ram_man (12/18/13 06:29 PM)
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#3220935 - 12/18/13 06:34 PM Re: slight miss at idle [Re: ram_man]
brandini Offline


Registered: 10/08/09
Posts: 1154
Loc: Richmond, VA
Winter gas?
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#3220948 - 12/18/13 06:56 PM Re: slight miss at idle [Re: brandini]
ram_man Offline


Registered: 03/15/13
Posts: 2853
Loc: southern mo
Originally Posted By: brandini
Winter gas?


ehh that wouldnt cause the little miss at idle though. And the gas mileage varies from tank to tank. It was 32 then 36 now 31 and this tank is right around 29.its getting worse,


Edited by ram_man (12/18/13 06:59 PM)
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#3220952 - 12/18/13 07:01 PM Re: slight miss at idle [Re: ram_man]
Eddie Offline


Registered: 12/07/03
Posts: 8572
Loc: Florida, Cape Coral
Sticking exhaust valve?
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#3220964 - 12/18/13 07:17 PM Re: slight miss at idle [Re: ram_man]
ram_man Offline


Registered: 03/15/13
Posts: 2853
Loc: southern mo
Engine has been very well maintained. And runs good while drivimg.
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#3220971 - 12/18/13 07:23 PM Re: slight miss at idle [Re: ram_man]
c502cid Offline


Registered: 01/17/03
Posts: 884
Loc: Elizabeth. Colorado
Even though I would have guessed a dirty throttle body I see you tried that. I'd get the exhaust analyzed and see what the readings are, might tell you a bunch. O2 sensors get lazy as they age.
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#3220988 - 12/18/13 07:48 PM Re: slight miss at idle [Re: ram_man]
beast3300 Offline


Registered: 12/24/09
Posts: 3142
Loc: Ohio
What kind of spark plugs are in it?
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#3220991 - 12/18/13 07:49 PM Re: slight miss at idle [Re: ram_man]
Cujet Offline


Registered: 02/15/03
Posts: 5896
Loc: Jupiter, Florida
Could be a dirty injector. I've had luck with Chevron Techron in the fuel. Believe it or not, MMO in the fuel might help too (but I did not say that) smile

However, as engines age, compression changes, valves don't seal as well, injectors don't spray as cleanly and so on. It all adds up to a slightly rough idle.
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#3220996 - 12/18/13 07:53 PM Re: slight miss at idle [Re: Cujet]
ram_man Offline


Registered: 03/15/13
Posts: 2853
Loc: southern mo
Originally Posted By: Cujet
Could be a dirty injector. I've had luck with Chevron Techron in the fuel. Believe it or not, MMO in the fuel might help too (but I did not say that) smile

However, as engines age, compression changes, valves don't seal as well, injectors don't spray as cleanly and so on. It all adds up to a slightly rough idle.


ngk copper plugs.
Its got 123,000 miles.
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#3221003 - 12/18/13 08:01 PM Re: slight miss at idle [Re: ram_man]
beast3300 Offline


Registered: 12/24/09
Posts: 3142
Loc: Ohio
Originally Posted By: ram_man
Originally Posted By: Cujet
Could be a dirty injector. I've had luck with Chevron Techron in the fuel. Believe it or not, MMO in the fuel might help too (but I did not say that) smile

However, as engines age, compression changes, valves don't seal as well, injectors don't spray as cleanly and so on. It all adds up to a slightly rough idle.


ngk copper plugs.
Its got 123,000 miles.


Gapped at .040?
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'03 Regal GS L67: PP 5w30/FU3980

'99 Grand Prix L36: QS HM 5w30/STP 3387A E-core, Filtermag

'07 LaCrosse L26: PG 5w30/ProSelect 21040

ASE L1 MT


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#3221029 - 12/18/13 08:26 PM Re: slight miss at idle [Re: ram_man]
artificialist Offline


Registered: 09/23/07
Posts: 8414
Loc: Florida
Many Saturns of that time had failure prone coolant temperature sensors. Sometime one sensor was connected to your gauges, and another one connected to your ECU. This could make you think that your sensors are fine when they aren't.

Such sensors aren't expensive, thankfully.
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#3221031 - 12/18/13 08:27 PM Re: slight miss at idle [Re: beast3300]
ram_man Offline


Registered: 03/15/13
Posts: 2853
Loc: southern mo
Originally Posted By: beast3300
Originally Posted By: ram_man
Originally Posted By: Cujet
Could be a dirty injector. I've had luck with Chevron Techron in the fuel. Believe it or not, MMO in the fuel might help too (but I did not say that) smile

However, as engines age, compression changes, valves don't seal as well, injectors don't spray as cleanly and so on. It all adds up to a slightly rough idle.


ngk copper plugs.
Its got 123,000 miles.


Gapped at .040?


Yes I believe that's what it is specd for. Double checked it
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#3221033 - 12/18/13 08:28 PM Re: slight miss at idle [Re: artificialist]
ram_man Offline


Registered: 03/15/13
Posts: 2853
Loc: southern mo
Originally Posted By: artificialist
Many Saturns of that time had failure prone coolant temperature sensors. Sometime one sensor was connected to your gauges, and another one connected to your ECU. This could make you think that your sensors are fine when they aren't.

Such sensors aren't expensive, thankfully.


mine has one ects. Its the metal sensor
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#3221049 - 12/18/13 08:44 PM Re: slight miss at idle [Re: ram_man]
99Saturn Offline


Registered: 02/25/13
Posts: 1389
Loc: NY
Ignition control module maybe. Probably some cheaper things to try first.

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#3221062 - 12/18/13 08:54 PM Re: slight miss at idle [Re: 99Saturn]
ram_man Offline


Registered: 03/15/13
Posts: 2853
Loc: southern mo
Originally Posted By: 99Saturn
Ignition control module maybe. Probably some cheaper things to try first.


it has been replaced by the original owner. Not long before I bought it.
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