Question about 1994 GMC Jimmy

1 Answer

I have fuel pressure to my injection unit and spark, ive replaced my fuel pump, filter. nothin. it cranks but no start unless i pour fuel into my intake, it starts runs then dies.

Posted by on

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • GMC Master
  • 6,826 Answers

If the fuel is poured into the intake and it starts and dies, then it tells me that the fuel injectors may not be firing. This is controlled by the computer.

Do the injectors click when a stethoscope is placed on the injector?

Posted on Oct 08, 2010

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

What would make a not start unless I pour gas into intake


Hi Clyde:
Since you mention "gas rail" I'm assuming fuel injected.
I'd check the fuel pressure in the rail. Should be around 40 PSI.
If pressure is OK then injectors not working. Time to check cps.
You know the spark side is OK since it will run.

Nov 08, 2015 | Cars & Trucks

1 Answer

Im getting a crank/ no start situation on my 93 chevy astro ext 4.3Ltr v6 and ive never let a vehicle beat me b4 but this one is giving me a sound whoopin - pls help


Easiest way to trouble shoot a crank no start is to spray starting fluid into the air cleaner intake before you crank it. If it fires then dies it is a fuel problem. If it doesn't fire it is a spark problem. If it fires then dies, check the fuel pressure at the engine end of the fuel line. Pressure below spec prevents the injectors from working properly. See shop manual for the proper procedure.
If it doesn't fire put a spark tester at one of the plug wires set to the proper gap to measure the spark voltage being developed by the coil etc. Good luck.

Sep 22, 2015 | Cars & Trucks

4 Answers

I have a 95 grand Cherokee. I'm getting fuel, and I'm getting spark. I replaced the crankshaft position sensor, and it still wont start. I spray starting fluid in carb, it starts and dies. Please help


what does getting mean? which engine, 4Liter or 5.2 or what?
spark at all cylinders is getting and timed right?
runs on test fuel so sparks good, that means fuel is bad
or flooding or too little fuel.
code 12 cranking for 5 seconds, means sensors are ok.
why replace parts that make spark when sparks good, it run on test fuel, why worry spark.? and not just fueling.?

now lets do fuel, step one is fuel pressure, not squirt tests.or dribble test. a real tool called,a fuel pressure gauge that works, and nothing else, (unless rail is dry and now we know its not)

if all spark plug tips are dry, are they?
then its not injecting, (the ECU can cut injection for 2 reasons) ask
or there is no real pressure.
so we open the FSM and read page FUELING
49psi is idle pressure, (more cranking with so little vacuum)

the tests are all there,

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

Jan 30, 2015 | 1995 Jeep Grand Cherokee

1 Answer

I have a 1992 Honda civic lx with a 1.5 four cylinder, and Ive replaced the ignition switch the fuel pump relay and the fueled pump itself however, the fuel pump still doesn't prime when I turn the key...


no start , crank perfectly
so , got spark?
the ECU has programming (ROM) and in fact kills all fueling with no spark , (even if it thinks there is no spark, even if spark is ok)
all ECU use a way to read back spark quality, (ALL){LAWS}
how honda does it in code, i don't know , see C R O M E forum)
turn the key over means nothing to me.?? sorry, it doent/
try saying what postion? cranking? or just keyon.
now some more EFI rules.
The EFI (some) do not activate the pump relay until cranking.
some do just key on for 3 seconds, read the FSM, its free.
need a link to the free manual? read the ECU logic on that.?
and prime has a special meaning, it means purge air,
its not for fuel. some system send a fast prime pulse. to clear air from the pressure lines, this plus does not inject.
that is how EFI works,

the flow
1: key on, ECU sends prime pulse, (air purge)
2: some ecu, run pump for 3 seconds, and pressure hits 35psi? RTM.
3: all ecu activate pump cranking and running.
4: now check pressure. !" 36 psi FSM stated spec"
5: now crank, if the ECU sees no spark errors, it injects
6: if the ECU sees WOT. it stops injection to clear a flood, cranking.
those rules cover most ECU made.

honda this year has a special feature called,
Fuel Cut-Off Control'
if this messes up, it i can cut fuel
does this help?
even better is this site, (has all the facts..)
http://honda-tech.com/showthread.php?t=810101

Oct 07, 2013 | 1992 Honda Civic

1 Answer

Starting issues


So you know it is not getting fuel thru the injectors.
Have you checked fuel pressure at the rail, and do you know if the pump is running when you turn the key on ?

Sep 11, 2012 | 1998 GMC Yukon

3 Answers

I have a '97 chevy tahoe. the engine cranks, but won't start. checked trouble codes & got cycliner misfire, O2 sensor, & catalytic converter codes. i've replaced plugs & wires. still won't...


first, check all the fuses
did you check to see if there's spark at spark plugs?
did you check the fuel pressure? you need to do that to isolate fuel and ignition system.
if there is no fuel then check for fuel pump operation
if there is no spark then check the ignition system (coil, module and wirings)
if you don't have either one then the problem is in the computer system such as crank sensor, and computer itself

Mar 28, 2010 | 1997 Chevrolet Tahoe

1 Answer

CAR WONT START


If the car fired after pouring gas into the engine, then you should check your fuel pump, listen when you turn on the key, if you hear the fuel pump start and stop, then check your fuel pressure, all fuel injected vehicles have fuel pressure regulators, if your fuel pump isnt pushing enough pressure to the regulator the car will not start, and if it does start it wont operate properly, and may even leave you stranded.. If your fuel pressure is low, check the fuel filter, dirty filters restrict pressure, and are ALOT cheeper to replace than a fuel pump!

Sep 27, 2009 | 2001 Ford Focus

1 Answer

My s10 will turn over, but wont squirt gas through injecter


Does it crank? Do you have any codes? Check engine light? Do you have spark? No spark check coil, and connections, also it would be nice to know what year it is. Get codes read. No crank check battery and starter. No codes or lights check crank position sensor, make sure your pcm is good after replacing your ignition mod you could have blown it if you did do it right. (engine computer) Check cam sensor if applies. Crank and cam could prevent it from starting and I know one I think cam controls pcm's fuel delivery on gm's

Dec 30, 2008 | 1986 Chevrolet S-10 Blazer

Not finding what you are looking for?
1994 GMC Jimmy Logo

Related Topics:

255 people viewed this question

Ask a Question

Usually answered in minutes!

Top GMC Experts

yadayada
yadayada

Level 3 Expert

75822 Answers

Freddy

Level 3 Expert

1311 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22156 Answers

Are you a GMC Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...