Mechanics

ENGINE DIES UPON ACCELERATION

2001 Ford Explorer • 111,000 miles

Just had vehicle inspected, including engine scan for emissions, etc. On the way home, after about 5 miles, engine would not accelerate normally. Got it home after another 5 miles and parked it. Went to try it again; it starts and idles fine. Upon raising RPMs, engine shuts down. Acts like it is fuel starved. No check engine light or other obvious issues. It has good battery, nearly half a tank of gas, but will not go. Try to drive it and it stalls. It will idle, smoothly and without issue. If it were the fuel pump, it should not start or run, right?
Thinking it is a computer issue- aggravated by the inspection scan. Wild guess, for sure.
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Davidhvogel
August 29, 2013.



The problem wasn't necessarily present when they inspected it.

All "crank, no start" conditions are approached in the same way. Every engine requires certain functions to be able to run. Some of these functions rely on specific components to work and some components are part of more than one function so it is important to see the whole picture to be able to conclude anything about what may have failed. Also, these functions can ONLY be tested during the failure. Any other time and they will simply test good because the problem isn't present at the moment.
If you approach this in any other way, you are merely guessing and that only serves to replace unnecessary parts and wastes money.

Every engine requires spark, fuel and compression to run. That's what we have to look for.

These are the basics that need to be tested and will give us the info required to isolate a cause.

1) Test for spark at the plug end of the wire using a spark tester. If none found, check for power supply on the + terminal of the coil with the key on.

2) Test for injector pulse using a small bulb called a noid light. If none found, check for power supply at one side of the injector with the key on.

3) Use a fuel pressure gauge to test for correct fuel pressure, also noticing if the pressure holds when key is shut off.

4) If all of these things check good, then you would need to do a complete compression test.

Once you have determined which of these functions has dropped out,
you will know which system is having the problem.

Wrenchtech
Aug 29, 2013.