Question about 1995 Pontiac Sunfire

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Engine cranks, will not start

The car died suddenly and will not restart. It has good spark and fuel pressure, and the valve train is in time and good working order. Also the cranking compression is within limits. If you hold the throttle open (I know this is not normally something to do with a fuel injected engine, but desperate times...) it will hit some and almost start. I have studied the system and checked everything I was able to with my limited diagnostic equipment. kaharper@indiana.edu

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I would do a sensor check. Not sure specifically on this vehicle, but at least the german ones do a Cold temperature sensor, and inject more fuel into the cylinder to get the engine started

Posted on Jul 02, 2008

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Mine is doing the same thing but when i give it a shot of gas it starts, theres nothing leaking outta the hose, but i smell gas when i turn it off...fuel pump regulator?
do you have the specs on the FPR for pressure?

Posted on Jul 02, 2008

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2006 saturn ion will run fine be drive for while then all sudden will die and won't restart from 10 min to few hours last time replace fuel pump that was not problem still does it any ideas


You need to test ,see what's missing while it won't start . Spark ! fuel pressure test, injector . Pull spark plug wires off same coil , crank engine , is there a spark jumping from one coil tower to the other ? If not the crankshaft position sensor or ignition module is bad . Saturn No Start Case Study featuring Beau Danner I would say just because I know GM ,the ignition module or crank sensor is bad .

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00 Explorer 4.0 ohv v6. If cam position sensor fails will it cause, #1 engine to die at hwy speed 60mph? Also upon trying to restart, it cranks very fast, is that poss. cam sensor failure too? Thanks


No, to the second question- sensor won't make it crank any different. Faster than normal cranking often means a broken timing belt -less friction with the valve train not moving, so engine spins faster. But you have a timing chain, right? Any engine noise when it quit at 60mph? You could watch some valve action through the oil filler cap while the engine is being cranked, to make sure the timing chain is still intact.
If all is good, check for spark and gas to the engine. If stopped while running, it could be a failed fuel pump or a problem in the ignition system- cam or crank sensor, ignition coil, ignition control module, some of the things to check if no spark.

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Engine dies


if it shuts off while driving down the road. and restarts after 10 minutes, its usually a bad crank sensor that does this. it messes up timing and shuts off fuel supply.

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Intermitent dieing


metro, 1.0Liter>? 3cyl

or the LSI with the 4 cylinders.? TBI and not MPI

yours is TBI, One injector engine MPI came out in 1998.

your car has OBD2 computer so any scan tool will show

why spark is gone (if). (precursors ) cranked for 5seconds,



(what does has fuel mean? wet spark plug tips?)

got spark? it stalls and wont restart have half hour>?

intermittent engine stalling. seems starts cold and fails hot engine.



on all EFI, (besides a tune up) we check this.. (a full 60k tune up?)



1: if you loose 12vdc main power, at stall>? (dash lamps dim or die,

head lights dim or die? bingo!

no.

2: can you save the stall with a fast right foot?

a: easy (isc stuck closed?)

b: tad hard. (EGR main stuck open or or low fuel pressure)

c: impossible. (lost spark or near zero fuel pressure, 10PSI is no good.

which is it? and is #1 key to solving any EFI stalls !!!

3: lost engine compression say hot, never set valve lash ever? or cam belt slips or has slipped. ever do a 60k belt on cam, ever?



4: bad spark, weak, or dead, at fail, if spark timing is way off (check it) that mean the cam belt is bad and slipped. 60k mile service skipped.

5: bad fueling, (last) and the most complex.





that is the correct order, you can skip around but it only delays the discovery.

1 Bad DC power, 2 bad compression,3 bad spark 4bad fueling.

Example1:

you key on, and get CEL glowing, most likely the ECU has power

as that lamp tells you it has.

then you find its flooding, 99% are never tuned up, or lost spark

you check spark its gone, you check that cam spins (oil filler hole)

you connect scan tool and crank for 5seconds, the tool shows

CKP or CMP bad. the DTC error codes will tell you!!!

if spark is good, use the operators guide , for flooding

it says :crank at wide open throttle to clear foods"

it starts, and floods again. oops.

you check spark timing.and find the timing way off, retarded.

bingo the 60k belt slipped, fix belt.

you check compression (it should have been first) and find its 80psi

not 150 PSI (W.O.T)

belt slipped. (they all do , ignored, )



lets do one more,

: example.2

spark good,!

timing good on dizzy!

compression as spec. 150 x3 or 4.

it floods.

i find fuel pressure at 60PSI , 2 times spec.

i find the regulator bad, it fails all 6 tests in the fSM on this device.

or the fuel return line is clogged.

hope his helps. post engine size, and cyl. count.

and if ever tuned up this decade.

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My honda accord died while driving, and will not start, tried replacing fuel filter, there is fuel pressure and it cranks over but will not start


What you're describing could be a broken timing belt. To check the timing belt, if there is not a visual inspection hole, you will need to take off the timing belt cover or the valve cover.

The other possibility is a ignition/spark problem. Check for spark by pulling one of the spark plug wires, and look for spark as the starter is cranked. If no spark, check the distributor wiring and connections, If all good, it may be the ignition coil has gone bad.

Also, to be sure you are getting fuel, pull one of the spark plugs. You should smell fuel coming from that cylinder after the engine is cranked.

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"Cranks, but won't start". Replaced fuel pump, CKP, ICM & nothing


If the engine cranks over normally when you attempt to start you car, but the engine does not start, the problem may be NO FUEL, NO SPARK or NO COMPRESSION. The engine needs adequate fuel pressure, a properly timed spark and normal compression to start.


1) To find why the engine won't start, remove the air inlet tube from the throttle body, push the throttle open and spray a small amount of aerosol starting fluid into the engine. Crank the engine. If it has spark and compression but NO FUEL, it will start and run a few seconds before dying. If it does NOT start, it probably has NO SPARK.

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