Noticing my mileage is getting worse

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04-17-2014, 10:48 PM

Swamy21

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Noticing my mileage is getting worse

So my 95 GlE seems to be having ****ty gas mileage , I did a tune up last october ( air filter , sparkplugs , fuel filter , seafoam.) My injectors sound okay , not sure what should be done ?
Suggestions?

04-17-2014, 11:17 PM

asand1

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Any codes?

04-18-2014, 01:03 AM

dwapenyi

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If you've done every other maintenance item, then it's your primary O2s....even without a check engine light. Replace them.

04-18-2014, 01:23 AM

asand1

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Its more likely the KS. If we knew what any codes were it would help. The KS will not trigger a CEL either.

04-18-2014, 01:26 PM

Swamy21

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No codes that I know of , does the max have one or two sensors?

04-18-2014, 02:36 PM

asand1

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Just one knock sensor. You need yo have it scanned or read the stickies and do it yourself.

A bad ks will cause the ecu to go full retard on the timing, and power and economy suffers.