Trouble shooting engine codes 25 and 71.

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Failing emissions for High HC's recently did a tune up, replaced the O2 sensor, new cat converter and muffler. Exhaust is very strong smelling and black at times. Truck runs good up to speed but after warming up idles low around 600-700 rpms. tends to burn a little oil between changes. Approaching 300,000 miles on Frame around 200,000 on current engine. Any Advice

jskelton522 in Gallatin TN

Oct 19, 2011

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RepairPal Certified shops can diagnose and repair your 1994 Toyota Pickup. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.

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Trouble shooting engine codes 25 and 71.

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jskelton522 in Gallatin TN

Oct 19, 2011

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patrick mannionon Oct 19, 2011

Air fuel Ratio lean and EGR issues are the two codes stored. It could be so many things its hard to guess without being able to do some basic tests first hand. Check you don't have a vacuum leak a bad/not sealing EGR valve, check the ignition timing (bridge E1-T1), they are a simple truck brilliant engine. High CO is usually lean running condition but you have to look at HC in relation to CO on a gas analyzer to draw conclusions.

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Popular Answer

What are the best Toyota repair shops?

RepairPal Certified shops can diagnose and repair your 1994 Toyota Pickup. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.