2005 TOYOTA INTERMITTENT HARD STARTING

  • Tiny
  • bbstacker7072
  • 2005 Toyota

Engine Performance problem
2005 Other Toyota Models 4 cyl Front Wheel Drive Automatic 86345 miles

I have a Scion XB. Out of the blue I began having hard start problems. By that I mean that I went from 4 or 5 revolutions to start to 6 or 7 seconds. There have never been any codes current or pending. It has always run flawlessly, and maintained meticulously.
I have done the following or the following conditions exist: battery is always fine, engine turns over the same whether it starts fine or doesn't. If I suspect a problem and turn off and try to restart, it starts fine the second time. I have, out of sheer frustration, changed the cam and crank position sensors, cleaned the MAF sensor with the proper cleaner, swapped the c/opn relay, efi relay, and checked the start relay contacts and operation. I have re-seated the four ecu plugs. I have replaced the fuel pump, fuel pressure regulator and filters. I even changed the plugs and insulated the metal fuel line which runs beside the block, even though this problem happens as much cold as hot.
Should I consider getting a fuel pressure gauge or another ecu(used, but warrantied) from Ebay. I'm just about to pull out my hair, but I haven't that much to spare.
I will most certainly pay for the proper advice. Thanks.

Monday, September 7th, 2009 AT 2:32 PM

3 Answers

  • Tiny
  • Docfixit
  • Expert
  • 18,991 posts

Maybe dirty fuel injectors and carbon build up on intake valves. Try some Techron fuel system cleaner

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Monday, September 7th, 2009 AT 3:02 PM
  • Tiny
  • bbstacker7072
  • Member

Thanks, Doc. I put a container of it in this afternoon. We'll see what happens. I was considering pulling the injectors and cleaning them in my ultrasonic cleaner. I'll give the Techron a chance first, though.
Thanks!

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Monday, September 7th, 2009 AT 8:20 PM
  • Tiny
  • Docfixit
  • Expert
  • 18,991 posts

If the Techron shows some improvement conseder a product SEAFOAM it will clean injectors and decarbon engine.

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Tuesday, September 8th, 2009 AT 2:09 PM

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