delayed start ignition

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delayed start ignition

Postby coachone » Thu Feb 20, 2014 6:19 pm

Hi My Toyota Tundra has developed a delayed start. Upon starting the vehicle it cranks continuously on its own before struggling to eventually start. What kind of pico  test investigation should I do?

Many thanks
George
Convoy Manager
coachone
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Re: delayed start ignition

Postby valiantman » Mon Feb 24, 2014 3:21 am

I wouldn't break out the pico - yet. First I'd have a good scantool hooked up & look at data PIDs for any abnormalities such as temperature sensor readings, good rpm while cranking, IAC/ throttle control, fueltrims once in closed loop, etc. Does this truck run normally once it starts?

Hard start is similar to no-start. You gotta have enough air/compression, fuel, & spark- all at the correct time. You need some indicator to give diagnostic direction before doing scope-work. About the only general test I'd do is to load test the battery- possibly use your scope to look at battery voltage while cranking (is relative compression even?).
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Re: delayed start ignition

Postby coachone » Fri Feb 28, 2014 2:07 pm

Hello Valiantman, thank you so much, would be carrying out the recommended test and get back to you. Yes it runs normally but the engine has gone off whiles driving on two ocassions. We had to park for a while before it started again
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