well yeah when i first got this car the firs motor was defected it had water in the oil n had knock soo i got the motor replace 1500 bucks for a new motor but this motor is a year 2000 engine 2.7 it had 80.000xxx miles on it m8 would a 2004 still be defective???? cuZ IS A PROBLEM AFTER PROBLEM M8 AM GETTING TIRED OF THIS PEACE OF SH@&$% LOL ANYWAYS IS PRETTY LOOKING CAR I JUST WANT TO GET IT FIX I JUST DONT HAVE ALL THAT MONEY TO SEND IT TO A REPAIR SHOP HOW MUCH DOS IT COST TO DO A FUEL PRESSURE TEST????

 

what is M8 suppose to mean?

how much does it cost?, depends on the shop. For people I like I'd do it for free. it takes like 10 sec to do. You can probably rent a fuel pressure gauge from autozone for free. the 2.7 is a PIECE of S.

PEACE out!

 

I have assumed that m8 is short for mate (a kind of out of country meaning of dude... but I'm not exactly sure!). Anyway, like you said the 2.7 is not the best option for an engine but we all try to make due with what we have.

A pressure tester costs about $15 if you buy one from a store and is very easy to preform. To do it correcty you also need a vaccum pump and gauge... another 20 bucks for it but a well spent investment!

 

why does he need a vacuum pump? and why can't people ever spell vacuum correctly?

 

yaaa m8 lol yeah like i was saying i will try that in case is not the fuelpump what else could it be

 

To test the fuel pressure @ simulated manifold vac for known preformance responses... It's in the book!

 

Could be one of many sensors giving a bad value when cold. Resistance values change when electronics get hot or cold. Might be a stuck EGR valve. Could be a weak spark (when hot it's not as hard to ignigte the gas).

There are many ways to go, but I'd start with the basic fuel, fire and air. Then determine which basic is at fault and then isolate the malfunction in that system.

 

the 2.7 does not have a vacuum controlled fuel pressure regulator!

so what does he need a vacuum pump for?

any sensors that are not working proper will set a code. he only has a P0420 which is catalyst failure.

 

Ah, I didn't know that about the 2.7! As for the codes, that's not always true. If a sensor is just misreporting the data, the computer d/n flag it eg when the map gets stuck at a value, it will not trip a code, but if you unplug it, it will set a code and go into limp in mode. I have seen this with many map sensors

 

actually on obd1 sensors that were in range but didn't move usually didn't set a code. but with obd2 if the sensor doesn't react appropriately, it will set a code. for example if a map sensor tells pcm it's at 17"hg and the pcm sees the tps go wot, it's going to expect the map to change. if it didn't a code will be set.

but still the ONLY way to really diagnose any problems is with a quality scanner that shows data values and allows functional testing.