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How do you know if the engine computer is bad

My car is miss firing and has no power,only about 25 mph max..i think its the engine computer,tried everything else,plugs,coils,compression etc,how do i check my engine computer?.do i need to take it to the auto repair etc?

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What size motor. Is fuel pressure good? Make sure catalytic converter in not plugged. Pete

Posted on Feb 08, 2012

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How to fix asm emission test failure hc( ppm) max 61 gp 274 meas 690 at 15 mph, at 25 mph max 36 gp 224 meas 804


this is easy,, it can be 1 or 2 problems.

1: CAT is dead or weak, new cats can in fact hide a crappy engine.

2: bad engine. runs like junk and does not burn all its fuel.



any good shop can find this is minutes.

what I DO (no 5gas mach)

i check for (scan tool costing me $9 whole bucks) ask)

i check for closed loop status, idling

if ok then at 15mph and then 25mph , just racing motor in neutral.

if all 3 tests pass, im good.

if any fail, i fix that. bad fueling, bad spark or whatever.



if all 3 pass, its NEW CAT TIME



easy huh? a binary answer.

bad cat, bad motor. (or both)



when i say bad motor that means,every inch of the EFI/engine system.

every drop.

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go to autozone and have them look and the check engine light and that will help you figure it out. they should also give you a piece of paper that will tell you what is wrong take that to an auto mechanic and ask his opinion

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Loss of power, car was laboring and flashing engine light came on. Later the power came back and engine light is out. I was on the freeway around 60-65 mph, going up a small grade on a clear and warm...


When your engine light flashes a you the computer is telling you that you have a hard, cosistant miss fire (one of the cylinders is not firing) you need to get the codes read to find out what cylinder it is then go from there.

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Engine Back fired, blew out muffler.


Sounds like you may have gotten some debris in your exhaust pipe or something was clogging your muffler. Maybe the innerds of you Catalytic Coverter went and got stuck or the innerds of your muffler gave out. That would be the only few things I could think of to cause something like that.

Sincerely,

JC

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