2000 Jeep Grand Cherokee Laredo Logo
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mike sabin Posted on Feb 07, 2014
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No start has spark injector pulse, fuel, no codes

Has fuel pressure, has inj. puls, has spark, no codes, cranks fine, 125 psi compression per cylinders no start

1 Answer

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  • Jeep Master 20,706 Answers
  • Posted on May 11, 2014
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Joined: Apr 06, 2013
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Did you fix this yet, old post.
which engine, we cant guess that. ever.? (we know it's not a diesel)
if the engine has spark and fuel
and it dont start:
it's flooding? (spark tips soaked in raw fuel, ) we look at them......
did you try the operators guide trick, cranking with wide open throttle?
this cuts fueling , clearing a flood condition.
spec, is 120 to 150 PSI. 4.0L
or 4.7L?
good spark to ALL cylinders is the correct test, not just 1.
does the timing light show correct timing? cranking? spark timing?
ever do a tuneup, with new spark plugs yet.
If the above is true it will start. or at least on test fuel.

one way to find problems like this , if the spark is good.
is to cut all fuel injections. (i kill the fuel pump, ask how.)
and start car with test fuel, if it runs for 3 seconds each try.
then all is good , engine and spark, if not , not.
a simple test. that is. and works on all gas engines.

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

in this case he assumes the engine is good. and timed right.

FSM
http://www.jeep4x4center.com/knowledge-base/index.htm?utm_source=cj#service

I can run any engine, with no fuel in car. sure can.
and is safe to do.
use CRC.
http://www.crcindustries.com/ei/product_detail.aspx?id=05671

5 Related Answers

emissionwiz

Marvin

  • 85242 Answers
  • Posted on Sep 17, 2008

SOURCE: 2000 jeep wrangler no injector pulse

Have you tested the PCM fuse??

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Anonymous

  • 1 Answer
  • Posted on May 14, 2009

SOURCE: I am working on a

how is your starter?

kevin bulsara

  • 234 Answers
  • Posted on Jun 05, 2009

SOURCE: JEEP WAS RUNNING FINE SHUT IT OFF AND WENT TO

pretty sure the injectors run of the ecu but woudnt swear to it cant u loosen a fuel line and see if pump is working

Ronnie Wilson

  • 1596 Answers
  • Posted on Aug 05, 2009

SOURCE: 1997 Nissan Altima Cylinder 1 misfire detected.

This Sounds Like a COIL PACK Problem

Anonymous

  • 6982 Answers
  • Posted on Oct 23, 2009

SOURCE: 1999 Jeep Grand Cherokee Larado wont start.

If computer sees no crank sensor signal it shuts down pulses to the injectors. But, you bring something new into the mix. Make sure fender grounding is good so the relay can operate properly and make sure power going to it is not restricted by a loose or dirty contact on the power side.

Testimonial: "Sounds like a good start"

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1answer

I'll have no pulse or power to my injectors spark is good and petrol pump running but no start on my Ford Bantam 2006 rocam motor

what does pulse mean, scope or NOid test lamp dead on injector
or the injector tips do now spray when engine is cranked
we can not see you doing the tests and matters.


symptoms. my guess African car, and no engine told, gas/petrol not told
sizes in CC or liters. 4cylinders? (roller cam sure)
2006 is GEN 3.
wiki says it is
1,297 cc and 1,597 cc Rocam (Roller Finger Camshaft)
1.3 or 1.6L which one? SOHC
Brazilian-designed Rocam engine is of single overhead-cam configuration with two valves per cylinder.

dead engine, cranks fast right but engine is dead, will not start or stay running.
won't start with quick start spray works, but will not stay running,
seems it has spark (spray works and sounds good)
starts but will not RUN, (spray lasts for 3 seconds)

so is the cam belt ignored and now slipped (if has belt, no books here)
all fuses, good
scan the PCM for DTC error test

the PCM cuts fuel (injectors) for many reasons, for sure to not catch fire.
1: all fused checked for good in all fuses boxes. as in ALL.
2:no real engine told or country told so folks can help with more exact answers
causes, injection dead ( but PCM fires them with electrical pulse)
top cause fuel pressure not to spec,
the crack a line dribble tests are no good. if dry yes but dribble tests mean zero.
the PSI (BAR)_ pressure must be at spec to the fuel rail.

that is one answser, now lets to , injector all 4 pins have no electrical pulse using noid test lamp or scope see the super fast pulse there, 5mS (0.005 seconds)
that cause is, PCM sees spark dead even if spark is good
the PCM seens throttle by wire dead if present, (no books in USA for bantam)
PCM sees CMP or CKP sensor errors, cam or crank sensors.
PCM sees IMMO failing (security key if has it)

now answer 3.
the engine compression is not 150psi and up tested. 10Bar up, not less.
on all 4 cylinder, and near even.

EGR stuck open
CAT core melted and now engine can not pump air, or run.
lots of test to do .
but I bet fuel pressure is wrong, at the rail 30psi up. for most cars
I have no PSI spec, 2bar up. fuel pressure. not zero not 1. but 2 up.
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I have a 98 gmc 2500, w/ 454 engine.. Recently the engine was making some major noise so I took off the valve covers to find that the pushrods were very loose. I then dissected the truck taking off the...

Engine Cranks But Will Not Start Basic Checks:
A. Test Fuses. Test both under hood power distribution center and the fuse panel under dash. This is done with a test light tool. The test light should illuminate on both sides of the fuse, if not the fuse has failed and needs to be replaced.

B. Testing Fuel Pressure Test for proper fuel pressure with a test gauge on the fuel rail, most throttle body injection cars (TBI) are between 13 psi and 17 psi. and most (DPI) direct port inject systems are between 40 psi and 55 psi. If no or little fuel pressure is observed and there is 12 volt power present the fuel pump, the fuel pump needs replacing.

C. Checking Timing Belt Test for compression by removing a spark plug and insert a compression gauge. Crank the engine over about 5 seconds the gauge should read between 125 psi and 165 psi, if no compression is observed remove front engine cover to inspect timing belt or chain. Crank engine to observe cam rotation, if the cam does not rotate the timing belt or chain has failed. (note: if the timing belt drives the water pump it is best to replace the water pump at this time)

D. Test for Injector Pulse Remove injector connector to insert injector test light (node) or volt meter. Observe light flash or gauge pulse while cranking. If light/voltmeter doesn't respond, an ignition distributor/crank angle sensor (CKS) or an ignition module is most likely your problem.

E. Test for Ignition Spark Remove spark plug wire, insert an extra spark plug into end of wire, rest spark plug next to a ground source then crank engine. You should observe a blue spark between the spark plug gap and ground source. If no spark is observed, an ignition coil, ignition rotor or spark plug wires might have failed. (always keep hands away from engine when cranking)


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My 98 ford explorer wont start its turning over and getting spark and fuel

OK IF YOUR YOUR SURE YOU HAVE SPARK AND FUEL THEN THE PROBLEM IS AIR OR COMPRESSION I WOULD THINK COMPRESSION DO A QUICK COMPRESSION TEST AND I THINK YOU WILL FIND THE PROBLEM IS A BROKEN TIMING CHAIN ONE OTHER POSSIBILITY IS A PLUGGED CATALYST BUT FOR BOTH BANKS TO BE PLUGGED TO THE POINT IT WILL NOT START IS VERY RARE GOOD LUCK (WHEN YOU SAY YOU HAVE FUEL DO YOU MEAN THE FUEL PRESSURE IS GOOD AND YOU HAVE INJECTOR PULSE OR JUST THAT YOU HAVE GOOD PRESSURE THE INJECTORS MUST PULSE AND HAVE AROUND 45 TO 60 PSI (RULE OF THUMB) FOR IT TO START ) USE A NOID LIGHT TO TEST INJECTOR PULSE OR IF NOT AVILABE SUBSTIUTE A 194 BULB AND BEND THE WIRE TABS FROM THE BULB DOWN AND PLUG THEM INTO THE INJECTOR HARNESS (NOT RECOMMENDED FOR ASIAN OR EUROPEAN CARS ) THIS LIGHT WILL BLINK WHEN CRANKING OR RUNNING IF YOU HAVE INJECTOR PULSE
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No injector pulse on 94 grand am 2.3dohc

Fuel pump relay may be weak. Try removing the connector from the oil pressure switch and connecting the terminals together so as to bypass the switch.
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0900c1528025f999-w4b4mlj24aijk5uz5dqx0bra-4-0.gif
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2001 tiburon won't start i have replace the fuel filter plugs cables coil pack fuel pressure regulator. i don't know what else to do. may be is the timing belt

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Crank no start: has no spark and only has injector pulse on cyl # 1. if you spray starting fluid directly into throttle body car starts and stays running and has spark and inj. pulse. once you turn the car...

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Cranks but wont start

Engine Cranks But Will Not Start

For an engine to run, you need three things to happen inside the engine. Compression, fuel and ignition, without any one of these components the engine will not run.
Basic Checks:

A. Test Fuses. Test both under hood power distribution center and the fuse panel under dash. This is done with a test light tool. The test light should illuminate on both sides of the fuse, if not the fuse has failed and needs to be replaced.
B. Testing Fuel Pressure Test for proper fuel pressure with a test gauge on the fuel rail, most throttle body injection cars (TBI) are between 13 psi and 17 psi. and most (DPI) direct port inject systems are between 40 psi and 55 psi. If no or little fuel pressure is observed and there is 12 volt power present the fuel pump, the fuel pump needs replacing.
C. Checking Timing Belt Test for compression by removing a spark plug and insert a compression gauge. Crank the engine over about 5 seconds the gauge should read between 125 psi and 165 psi, if no compression is observed remove front engine cover to inspect timing belt or chain. Crank engine to observe cam rotation, if the cam does not rotate the timing belt or chain has failed. (note: if the timing belt drives the water pump it is best to replace the water pump at this time)
D. Test for Injector Pulse Remove injector connector to insert injector test light (node) or volt meter. Observe light flash or gauge pulse while cranking. If light/voltmeter doesn't respond, an ignition distributor/crank angle sensor (CKS) or an ignition module is most likely your problem.
E. Test for Ignition Spark Remove spark plug wire, insert an extra spark plug into end of wire, rest spark plug next to a ground source then crank engine. You should observe a blue spark between the spark plug gap and ground source. If no spark is observed, an ignition coil, ignition rotor or spark plug wires might have failed. (always keep hands away from engine when cranking)
0helpful
2answers

Doesn't start

1. Test Fuses. Test both under hood power distribution center and the fuse panel under dash. This is done with a test light tool. The test light should illuminate on both sides of the fuse, if not the fuse has failed and needs to be replaced.
2.Testing Fuel Pressure Test for proper fuel pressure with a test gauge on the fuel rail, most throttle body injection cars (TBI) are between 13 psi and 17 psi. and most (DPI) direct port inject systems are between 40 psi and 55 psi. If no or little fuel pressure is observed and there is 12 volt power present the fuel pump, the fuel pump needs replacing.
3.Checking Timing Belt Test for compression by removing a spark plug and insert a compression gauge. Crank the engine over about 5 seconds the gauge should read between 125 psi and 165 psi, if no compression is observed remove front engine cover to inspect timing belt or chain. Crank engine to observe cam rotation, if the cam does not rotate the timing belt or chain has failed. (note: if the timing belt drives the water pump it is best to replace the water pump at this time)
4.Test for Injector Pulse Remove injector connector to insert injector test light (node) or volt meter. Observe light flash or gauge pulse while cranking. If light/voltmeter doesn't respond, an ignition distributor/crank angle sensor (CKS) or an ignition module is most likely your problem.
5.Test for Ignition Spark Remove spark plug wire, insert an extra spark plug into end of wire, rest spark plug next to a ground source then crank engine. You should observe a blue spark between the spark plug gap and ground source. If no spark is observed, an ignition coil, ignition rotor or spark plug wires might have failed. (always keep hands away from engine when cranking)
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