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Fuel pressure specs

Car tries to start but will not run checked every thing as far as compression,fuel press. spark and they checked out good. Tried resetting pcm,checked all sensors. spark plugs are getting fouled,second set already. got it running the other day and let idle for a few minutes,moved it, parked it now same thing all over again I did put some oil in the cylinders that time and the new spark plugs. could this be the solution. one more thing; the CEL flashes 8 times and the immobilizer light is flashing even after I unlock the doors with key.

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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SOURCE: Check engine light comes on temporarily - engine chuggs at idle

Before changing you pcm try cleaning your egr valve. remove the valve and see if its stuck in the open position if so use a small pick to clean around the spring.

Posted on Mar 12, 2009

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Molson02536
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SOURCE: Won't run

There are to many things that can cause the no start. Here is a link that can help you understand the possible problems and links to how to retrieve the DTC codes which is activating your Auto Shutdown relay.
Good luck and hope this helps. Keep me posted http://www.allpar.com/fix/stall.html

Posted on May 26, 2009

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SOURCE: i have a 2000 gmc sierra 5.3 with a number 6

I would check the valves for number 6. If one or both are burned, stuck or out of adjustment it would cause your problem. If a cam lobe for that cylinder is burned or badly worn it could be the culprit.

Posted on Jan 10, 2010

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SOURCE: 2003 Tahoe, 5.3 liter vortec flex fuel. Engine

this is a comon problem on chevy 00-06 models a computer ground ,it seems ok at sight but inside it's just holding a few wires ,get under the car on the driver side passenger there you should find a two ground wire goin to the block a big, and a small ,the small one gets coroded try to fix it and let me know how it goes ok.

Posted on Feb 25, 2010

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SOURCE: STARTS and runs well but

I had the same problem but when I changed the Mass Air Flow it was solved. I am suprised that you changed the MAF and you are still getting problems. Please get an OBD check. The problem must be having something to do with electronics and the ODB will definetly be able to read it.

Posted on Sep 06, 2010

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2 Answers

Turns over but does not start


First thing you can do do is spray a little carburetor cleaner in the throttle body if it start you a fuel problem if it doesn't start you have an ignition problem go to autozone buy a cheap noid light remove the injector harness install the noid light crank the engine if the noid light blinks your ok as far as computer also get and old spark plug check for spark while cranking if you have spark igintion system ok ck fuel pressure might have a clogg up fuel filter good luck

Oct 02, 2015 | 2002 Ford Explorer

2 Answers

My car cranks but will not start RVR GDI mitsubishi


Check all fuses first, then with an assistant, check for spark with a spark tester. if there is spark at 2 plugs, check for fuel pressure at the fuel rail with a gauge. Engines need three things to run, fuel, spark, and compression. If there is spark and fuel, do a compression test, if the timing belt jumped/broke, you won't have any

Mar 03, 2015 | Mitsubishi Cars & Trucks

1 Answer

Injectors or distributor not firing


so now its timed wrong, right? double failure.

no engine option stated, wow. 1.0L or 1.3?

rule 1 on all EFI gas cars

no spark ?the ECU sees this? and cuts fuel. ! by design.

so spark,is first after good spec. compression.

check spark first. to all cylinders.

compression over 150psi?

a timing belt slip causes, like 80 psi, retarded bad cam.

so>>> stop skipping 60k tuneups and the new belt>????

?

if spark is good and compression , next is FUEL.

does it run on test FUEL for for 3 seconds? (spray induction port)

if not ?back up to my above list. BINGO on above.....!@!!!!

runs on test fuel for 3sec.? yes so,......



so is the ECU >CEL flashing 12s, all is well> no DTC\'errors?

flashing 12s it is.....

then

check fuel pressure using a real tool called a GAUGE>

to spec.



that is the order. no other works unless LUCKY

avoid luck, and wild guesssing.do the tests.

ask

Apr 21, 2014 | 1992 Geo Metro

1 Answer

1998 jeep grand cherokee will not turn over but fuel pump is fine


fine? ( 30 to 40PSI , fine, not squirt tests or sounds)

EFI demands full pressure all the time, its not like carb cars of old.

first off, no engine stated ,so all help will be poor, all cars have engine options.. to work on any car , open hood, (USA commenter) and look up see that EPA sticker there, and the engine ID< and displacement?



That is first. (ill pretend , you drove to my shop and what id do)

i ask owner, when\'s the last time car was a daily driver?, last week or last decade>? (bad fuel, etc,....happens)



i stick finger in air, its 50F, not -40F air temp, ok not in Canada. cool. er its hot...

i open hood and see a I6 4.0L engine, with EFI. ok.



2: i check all the fuses. it\'s EFI and blown fuses, will kill the show.

3: i turn the key , and check engine lamp glows, (ECU is happy)

(ecu has juice , so boots and glows CEL, to say so)



4: i crank it, it cranks over 250 RPM, sounds like normal fast cranking

we all know that sound, we dont use the tachometer...



5: i then ask owner , evah\' tune it up this decade, answer no.

SSDD !

i then do the tune up, plugs were ratty. all spark parts, filters.

we dont use $100/hr labor to find ratty spark parts the install them

its called a tune up.



car runs like new. (end story) no?

or it was tuned up;.

so, i check spark it is blue-white on my test spark plug (new) times 6.

i then check spark timing, it\'s dead on, good, if off i fix that first.



if timing is off on most cars i check compression as some like

to slip cam timing. (i saw a V6 once with plastic timing gears. once burned ,twice shy , i check it all) (i do a compression test on all old motors. so I can see TRUTH, and potential future LIFE of engine)



ok, spark is perfect,please note my order, good motor?, good spark?

with bad motors and spark the fuel can not burn, not fully.



then, i try "test fuel" (can-o-spray) car runs for 3 seconds. and stalls.



my gosh, the motor and spark were good. verrroooooom stall....



(btw, this here, logic flow is bad on DOHC motors, 99% true) ask



i check spark plug tips and they are dry. (wet is flooding)

DRY !

i suspect low or no fuel pressure, i know from experience

that fuel pumps about 75% do not run only key on, only cranking

and running they run. so i check pressure.



i find its 10psi.

the story gets longer for flooding or injectors tests, ill skip that.. ask.

so 10psi,. i find

1: 12v to pump is really just 6v, if fix bad connector up stream from pump. done.

2: if 12v to pump cranking, mine was 11v, but the starter does that. drop so is ok. (study starting systems) , its good line voltage is good. cranking.



3: i then check the fuel pressure reg, and find the thing stuck wide open , i replace the reg. and pressure is 34 PSI (wild guess. didnt look yours up. ) car runs prefect now.

or

4: i find FPreg ok, but pump is weak, new pump saves day..

i have a scope and can see this pump is noisy, has a bad commutator segment, deep inside it... scopes, rule.

all above is good?

if pump pressure is at spec. cranking, then

do this long story, omitted due to fingers sore.

ask

the pump tests and spec are all covered 100% in a real FSM.

the spec is covered at alldata.com, log in and see it.

btw, all EFI just hates low fuel pressure.

the whole system is turned for good pressure,

and many systems do not even monitor it.

To understand that read the books by, Greg Banish



http://www.amazon.com/Engine-Management-Advanced-Greg-Banish/dp/1932494421/ref=sr_1_1?ie=UTF8&qid=1388070570&sr=8-1&keywords=greg+banish.



the pressure must be at spec, and must regulate perfectly

or the ECU fuel tables are all TRASH.



hard starts. (fast starter) nut shell.

1: bad fuel. or running summer fuel in winter

what is your air temp, not stated, and is big factor ,if very cold.

2; no tuneups. ever done.

3: bad spark or timing off,

4: low compression.

5: bad ISC, try starting with 10% throttle ,to mimic a good ISC.

6: flooding. soaking wet spark tips.

7: under fueling, dry sparks.



try test fuel. if dry.

Dec 28, 2013 | 1995 Jeep Grand Cherokee

2 Answers

Engine cranks no start key on engine off rpm reeds 575


i want to buy comma's so bad.
Engine cranks, but it don't start,
with key on,
engine off rpm reeds 575. (im cluesless here)
reads RPM 575 , not running and how pray tell did you
resolve the 5 at the end? what device showed that?
digital tacho or a scan tool? or dash tach? please tell this.


that is a good input , if true. the tacho on many cars is from
the spark primary signal, and if dead the car will not start.
is this a N.American car/ (unstated?)

the first checks (we go from easy to harder, and more tools)
1:got spark?
2: got fueling if spark is good, the ECU cuts fuel if it even suspects bad spark is true.
never look for bad fueling if the ECU reports bad spark.
that takes a scan tool to see what the ECU thinks, and sees.
got a scan tool they only cost $7, here.

If engine compression is at spec. W.O.T.
and spark is good.
then test fuel works all above is good,(mostly), if test fuel works
and it don't start up and stay running, with a fast right foot.
then the fueling system parts are bad.
this works for carb cars or EFI , this part is no different.
old school to new.

see scotty do it.
http://www.youtube.com/watch?v=064Ilsz8Fzg&NR=1&feature=fvwp

Sep 26, 2013 | 2004 Suzuki Forenza

1 Answer

Have a 1985 buick centruy with a 2.5 seems like its loading up with to much fuel wont start.I have spark timing is good, compression good, and changed the temp sensor. tried a different maf sensor(used)...


If you have spark, and the timing is good, you are either not getting enough fuel or there is not enough compression. If you checked the spark from the spark plug wires and got a spark, try changing the spark plugs. The spark from the plugs may be too weak to ignite the fuel.

Have you changed your fuel filter? This is a very common cause of a no start condition. Have your fuel pressure tested to ensure you are getting the correct amount of fuel. Also, you could try replacing your Fuel Pressure Regulator.

Feb 17, 2011 | 1985 Buick Century

2 Answers

1997 Chevy Silverado 1500 4x4 will not start. Getting spark checked all fuses, changed rotar - spark plug wires,


Have you checked the fuel pressure? Fuel pumps are a common failure item on those trucks. Pick up a cheap fuel pressure gauge and hook it up to the shrader valve on the fuel rail. With the ignition on and you should have 55-65psi. Even if it's a few psi below spec it could stop the engine from firing.Once you determine the fuel pressure isn't adequate make sure you have a good power and ground at the fuel pump. If that checks out, time for a new fuel pump module. I recommend only replacing it with an AC delco unit, I've heard bad stories about aftermarket replacements.
You could also spray some carb cleaner or starting fluid in the throttle body and crank the engine over. If it runs for a few seconds after spraying starting fluid in you know you have a fuel delivery problem.

Mar 14, 2010 | 1999 Chevrolet Silverado 1500

1 Answer

1989 Mistubishi Montero with rebuilt engine won't start.


You'll lneed to test for 3 things:
Spark at the plug
Fuel, making it to the cyliinder
Compression, above the minimum spec.

Sometimes when engines have been rebuilt, they have really poor compression as they try to start for a few minutes of cranking. If you have good oil pressure, check compression, if low add a tablespoon of oil to each cylinder to build compression, as soon as it starts it will begin to seat and seal itself, as well as provide ample lubrication.

For Fuel and Spark, just normal diagnostics, based upon your description, I won't mention doublechecking now that it has been cranked a bit.

WD40 can be sprayed into the intake while cranking to get one lubed a bit and to start to idle, it will stall when you stop spraying, indicating a shortage of fuel.

good luck

Feb 23, 2010 | 1989 Mitsubishi Montero

2 Answers

REplaced fuelpump , but it won`t start . I hear the fuel pump run and I was told the inline filter was replaced. So what is rong ?


Do you have a "no start" based on fuel, ignition, or engine problems? All of these are required to be good to start an engine. Must check for spark at plugs. If o/k check fuel pressure at fuel rail.If o/k check engine copression.

May 05, 2009 | 1993 Oldsmobile Cutlass Ciera

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