Question about 1999 GMC Savana

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Fuel pressure regulator

Misfire cyl. 5&7; compression, leak down, spark ok. fuel pressure drops to 0 after 2 sec.

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1 Answer

Fuel Pump may be bad & not hold pressure
Look up how to test a pressure regulator
The misfire on 5 & 7 could be a different issue,
smoke test the intake for vacuum leaks
Leak down & such maybe good but you still can
have mechanical issues in valve train or electronic

Posted on Jul 26, 2013

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Posted on Jan 02, 2017

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SOURCE: 1999 Yukon cold start problems.

1999 Yukon Start Issue - I have replaced the octopuse, battery, fuel filter, fuel pump, still having problems starting in cold weather, sometimes after a heavy rain.

Any suggestions?


Posted on Dec 08, 2008

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SOURCE: 1998 GMC Sierra- runs rough then stalls when

had this problem on my neighbors 98 chevy truck with the same engine !!
it turnd out too be the fuel pressure regulator,you have too pull the upper intake too replace it!!

Posted on Jun 06, 2009

  • 236 Answers

SOURCE: 1997 gmc savana 4.3,

only 3 things will cause this engine not to start (crank and not start) fuel, ignition, timing.
You haven't mentioned the engine cranks over or not, so I have to assume it cranks over.
Possible timing chain or the crank sensor on the timing chain. Have you checked this? you need to remove number 1 spark plug & when the piston is in the full top position on compression, remove the dist cap & see what spark plug wire the rotor is pointing to inside the dist cap. (I'm sure if you google checking for top dead center you'll find the proper procedure)

Posted on Oct 13, 2009

  • 880 Answers

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

  • 6826 Answers

SOURCE: 02 gmc sonoma 4.3 engine starts and runs great for

Smell of the oil,to see if the fuel injector(spider)is leaking into the crank case,if so,the intake will have to be removed to repair the problem,oh,and change the oil.

Posted on Jul 11, 2010

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2000 Jeep Grand Cherokee Laredo 4.7 liter code reads p0307 turn the car off when I turn it back on started misfiring and sputtering and wont stay started now help

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You have to determine which cylinder is doing the misfire. It may not be an ignition problem but possible injector problem.

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High co reading for emission

what rpm or speed, both? which Civic engine????? of the 5
and what country????? we can not guess this... ever.
and no one ever says.. here. 99% true.
why is not easy. 50ways there are.
it's running rich. (we have one good input. this)

but here are the reasons, (not the 50 causes) all the below are tests.
it's misfiring. is rich misfire.
causes: many I'll assume the cars 12v power is 10 to 145v at all times. 13.3v running minimum.
1: low compression on one or more cylinders. 150psi w.o.t is min.
2: bad spark or not timed right. to any cylinders. or all. tests.
3: bad fueling. above must be good (tools used and tests)

now if compression is good. and the EGR main down leak
if spark is good, what causes high HC,
simple misfire.
what causes misfire.
  1. bad spark plugs (ever tune it up? now be the time, huh?)
  2. bad injectors, leaking or clogged. clean em.
  3. fuel pressure too high, 28 is min, max (see end)
  4. you find one injector , NOID lamp test stuck ON.
  5. o2 sensors stuck lean (exhaust leaks)
  6. Fuel pump regulator stuck closed, causing #3
there are 5 engines, (why not state yours.??????0
1.5 L to 3.0L
the fuel pressure is different on all .
40-47 PSI. 1.7L and 2.3L
47-54 PSI on 2.0L and 2.2L
41-48 PSI on 3.0L
and then the exceptions
1-- Except SULEV: 48-55 psi SULEV: 47-54 2 Except SULEV: 47-55 psi SULEV: 48-55 psi
if you read the FSM,, it shows tests at the rail.
fuel pressure.
fuel regulation test.
shut test
injector leak down test.
and the injector balance test.
we do them all, or fail;.
all this is FSM.

do you want us to guess or test?
the latter avoids the 50 guesses. 49 being wrong.$$$$$$$$$$$$$

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1998 Suzuki sidekick. sputters when in park and reverse. plugs were changed, oil was changed, wires are fine. someone told me it could be my fuel pump????

did you check for errors (DTC) with a scan tool?
it can be lots of things. this is called Misfire.
When misfire gets bad the CEL lamp in the dash glows running
and stores code P030x x =0 to 4
but it is misfiring regardless
guessing and not doing tests, or a full tune up, are a waste , not hands on.
so here are all misfire cause.
if engine is good, its always bad spark or fueling.
does it misfire worse if you spray water on the spark wires.?
yes, well wires fail after 100k miles. , no magic there.
if in fact the fueling is bad, this is complex.
1: air leaks in the intake system or any hose attached.
2: bad injectors (clogged or leaking)
3: low fuel pressure, but you imply that wide open power is good, so why would you say pump.
4: fuel pressure regulator bad, on the fuel rail.
5: bad front oxy sensor.
6: OBD2 scans show other errors not stated here...
7: are any of the 40++ reasons stated on that link...

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Check engine light flashing misfire on # 7 cyl

wat was the compression? if good try doing a leak down test on that cylinder n compare to other cylinders.

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could be the fuel injector if it is stuck open or shorted to ground. check the compression first on that cylinder. if the compression is good check the fuel pressure bleed off time. if the pressure drops more than 20psi in 15 minutes it very well could be a faulty injector.

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I'm getting P0300,P0301,P0304,P0308,P0316,P0355.. Why am I getting so many misfires?? spark plugs look fairly new and there are 4 new coils on cylinders2,3,5,6.... What steps should i take?? will fuel...

So your codes are: Multiple random plus misfires on 1,4,8. Misfire during startup, and ignition coil E (cyl 5) primary or secondary circuit malfunction.

You said that four new coils were installed. Perhaps the coil to spark plug order and the firing order have been scrambled. The spark plug wires may be old and leaky--especially if they are the originals from 2003. You could have a vacuum leak into the intake manifold, the EGR valve could be sticking open when it should be closed, the fuel filter could be clogged, the fuel pump pressure could be too low or stuck at the idle setting, the fuel injectors could be dirty, and cylinder compression could be low (putting on the wrong size o-rings when reinstalling injectors will prevent proper compression.)

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