1994 Toyota T100 Repair and Maintenance
A guide to problems, costs, maintenance and repair for your 1994 Toyota T100
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1994 Toyota T100 ProblemsRough Idle and Backfiring Engine with Check Engine Light
The 2.7L engine used in the 1994-1998 Toyota T100 has a known issue with the valves that if left unchecked, will cause burned valves and engine performance issues.
The engine ‘breathes’ through valves that are pushed open by the camshaft, and closed by springs. When valves are closed, they seal against a valve seat. In this vehicle, the valve seat is too soft, so after the valve contacts it thousands of times, it becomes crushed. Once it is crushed, the valve can no longer make a proper seal, and the valves erode due to extreme temperature (burnt valve).
Symptoms related to this issue:
- Rough idle
- Backfiring through exhaust or intake
- Illumination of the check engine light
- OBD Trouble Codes P0300, P0301, P0302, P0303, P0304
- Loss of power
- Engine Stalling
To repair the burnt valves, the cylinder head must be removed and rebuilt, which is a costly internal engine repair, however, this issue can be prevented through inspection and adjustment of valve clearances every 40,000 miles.
The Throttle Position Sensor can get out of adjustment due to wear in the throttle body or due to carbon build up. This will cause the idle timing to advance more than 30 degrees which will cause very high HC and NOx emissions. Conversely, the Throttle Position Sensors can wear out and not properly advance the timing which causes a lack of power and poor fuel economy.
At higher mileages (125,000 -150,000) the power steering pump may begin to leak on the 6 cylinder vehicles and could require replacement.
1994 Toyota T100 QuestionsMy truck wont start i changed the battery,cables,ignision switch and the relay. Still wont start, runs fine after popping the clutch what else can i do? Thank you (1 answer)
Blinker signals work, but no other lights nor gauge work. Ac\heater doesnt even turn on...no air flow through vents. I replaced a 30amp fuse, assuming it was the problem. No luck. Suggestions? Answers?
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1994 Toyota T100 RecallsToyota Recalls 1990-1998 Trucks Due to Cracked Steering Relay Rod
Toyota is recalling 1990-1995 4Runner, 1990-1995 pickup, and 1993-1998 Toyota T100 trucks because the steering relay rod may crack under stress. This may increase the risk of a crash. Dealers will replace the steering relay rod.