Having problems with your 1994 GMC Sonoma ?

After driving for about 15 min check engine light comes on an rpms arent steady at a stop idle starts jumpin

Posted / edited by AnonymousUser on : 10-12-2018

Answers :

Hi, to me this sounds like your oxygen sensor (or lambda sensor for its true name) is on its way out it points to this being the fault as you say it drives ok for 15 min then plays up, the oxygen sensor dont start working until the engine reaches a certain temp so it does point towards that being the fault.
When it starts playing up if you let it cool down to cold then start it if it runs ok till it gets warm again then i would say its the oxygen sensor.

It may also be worth checking the fuel filter and replace if it has not been done recently also before you change any parts go out and buy a fuel line cleaner you can get these from most filling stations and car spares shops, just make sure you buy correct type ie diesel or petrol then pour this in your tank then give it a good run for about 30 min or more this will then ensure the complete fuel line is clean and this would rule out anything fuel related being the problem.

Repair Help & Product Troubleshooting for 1994 GMC Sonoma

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