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Replaced the Head gasket and engine will not start. Pulled codes said the tps is bad. replaced tps and now will only start sometimes but will not stay started.

The timing is all good. Just can't get it to fire.

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  • Toyota Master
  • 2,431 Answers

TPS,the TPS will not prevent a vehicle from starting,Listen to the cranking of the engine,If its whinny then the timing is off.If the timing is off it will trip a MAF (mass airflow ),even a MAF boot will cause a no start.Check the firing order also.

Posted on Nov 06, 2012

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Posted on Jan 02, 2017

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shaggyrat
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SOURCE: 1909 buick skylark tps low volts trouble code

replace ignition coil make sure by dealer the right mode is used when ordering if not ordered right you will get a difference in engine volts

Posted on Jun 07, 2008

  • 1071 Answers

SOURCE: car won,t start sometimes & check engine light

before changing any more parts there are grounds on the engine that need cleaned one on the back of intake manifold then you have to remove battery tray clean up the ground there then clean where the tray bolts up as this aids in chassis grounding remove ground cable from bellhousing before you reassemble install star washers btween cable ends and where they bolt up this will dig into ground surface and cables making a better ground then remove turn signals in front there are two on right side and one on left side cleanup and star washer then there is the ground spots for the ecm inside removr kick panel on right side clean up and star washer if the starter doesnt work after this starter is probably bad but the other codes will probably clear out

Posted on Jul 29, 2009

junit80
  • 81 Answers

SOURCE: 2002 Interpid 2.7 L died on road now no start!

sounds like a bad ecm aka computer to me.have ecm checked

Posted on Aug 15, 2009

  • 1428 Answers

SOURCE: mazda protege no start

There can be a misfire too from the cylinders.

An engine that hesitates, stumbles or misfires when accelerating or when it is under load is an engine that is either sucking too much air, not getting enough fuel or misfiring. If the Check Engine Light comes on, you may find any of the following codes:

• P0171, P0174 Lean fuel condition codes
• P0120 to P0124 Throttle position sensor codes
• P0222 to P0229 Throttle position sensor codes
• P0400 to P0409 EGR related codes

If there are no misfire codes, a common cause of acceleration stumble is a bad throttle position sensor (TPS). The TPS tells the computer how far the throttle is open. The computer uses this information to determine how much fuel is needed to maintain the correct air/fuel mixture and when extra fuel is needed if the throttle suddenly opens wide.

Another common cause is dirty fuel injectors. If varnish deposits have built up in the tips of the injectors, they won’t spray as much fuel as they normally do, or will “dribble” fuel instead of spraying a fine mist. This creates a lean fuel mixture and conditions that are ripe for stumble and hesitation (also misfire). Look at short term fuel trim (STFT) and long term fuel trim (LTFT) with your scantool. If the numbers are high, it tells you the engine is running lean and the injectors need cleaning. Treat mild cases with a high quality fuel-injector cleaner additive. Severe cases require professional cleaning equipment.

Also if this sensors apply to your vehicle, camshaft sensor or crankshaft sensor if sensors bad you don't get any spark. Also run a scan on the car.

Good luck and rate this solution, please.

Posted on Mar 22, 2010

SOURCE: 04' Ram 1500, bad mis-fire. cust repl s/plugs. no

You still have random misfires (PO300)
You most likely replaced those coils that set a code, and those were not the one bad offender,spiking the computer module.
Take a new coil and put in a cylinder,no change, replace old coil and move new one to next cylinder. You can do that once or twice a day, if you have nothing else to do. You need a 90 degree day, to really get that solved,unless you have an ignition oscilloscope.
Never had a bad spark plug in 45 years.

Posted on Sep 18, 2010

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