Question about 1994 Chevrolet Camaro

3 Answers

1994 Camaro 3.4l will not start when cold

If the outside temperature is around 40 degrees I have to turn the engine several times before it will start. Once engine is warmed up it cranks fine. Have replaced fuel pump relay, throttle position sensor, fuel filter, and fuel pressure regulator. However I have noticed that the fuel pump is not engaging when I turn on the key.
When I replaced the fuel filter it engaged for a little while.
While I had the regulator off I turned on the key and the fuel pump engaged then.

Posted by on

  • 1 more comment 
  • sandras_man Dec 09, 2008

    Also, there is little or no fuel pressure at the test port unless the engine is running.

  • sandras_man Dec 09, 2008

    Jumping the relay will not cause the pump to engage.

  • sandras_man Dec 10, 2008

    This makes sense and I never would haave thought of the check valve. Thank you very much.

×

3 Answers

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Top Expert:

    An expert who has finished #1 on the weekly Top 10 Fixya Experts Leaderboard.

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

  • Chevrolet Master
  • 60,667 Answers

You have one of 2 things going on here, but 1st let me explain how the fuel pump gets power from the ignition switch, when you crank the engine the pump receives power from the crank contacts of the ignition switch, once the engine starts the power comes from the run contacts of the ignition switch, so you may have an issue with the cranking contacts of the ignition switch, the other more common problem is that the check valve in the fuel pump is defective, this lets all the fuel drain back to the fuel tank when the pump is off, when you go to crank the pump has to pump the filter and the lines full and the air has to bleed out the injectors, what does this mean? long crank times and hard start, this problem is made worse by cold weather because n engine requires a richer mixture (more fuel) to start cold. One note if u turn the ignition to run but don't start the engine the pump will only run a few seconds then the computer will shut it off.

Posted on Dec 09, 2008

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    President:

    An expert whose answer got voted for 500 times.

  • Master
  • 1,450 Answers

So pump does not always come on when you turn key on? possible relay sticking at cooler temps. possible check valve bad in pump allowing fuel to drain back out of lines. need to install pressure gauge and see what is going on. if fuel drops to zero when key cuts off it is check valve.

Posted on Dec 09, 2008

  • 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.

  • Master
  • 10,515 Answers

First thing, if you haven't changed it in a while, change the fuel filter. Don't let the gas go below 1/4 tank or all the debris in the tank clogs your injectors.

If that doesn't help you will have to hook up a fuel psi guage to the car and see what kind of fuel psi you have..............



Posted on Dec 08, 2008

  • taran_2005
    taran_2005 Dec 08, 2008

    It could be an ignition switch or neutral safety switch. Do you have 12 volts to the purple wire at the starter solenoid? It may also be a blown fusible link at the starter.

  • taran_2005
    taran_2005 Dec 09, 2008

    First, the hose section between the pump and steel tube is a "pulsation damper" unless you were aware of the problems with those and installed a section of regular fuel line hose there instead. Those swell, soften, and split very frequently.

    Second, restricting the fuel return line will reveal any possible problems with the pressure regulator leaking through. If pressure is low but increases when the fuel return line is pinched closed, the regulator is probably leaking internally.

    Third, you need to get the pump to run before you can test fuel pressure. The pump should run for a two-second prime cycle whenever the ignition is turned on. The ignition will need to be turned off for at least 20 seconds before the pump will run a two-second prime cycle again on ignition power-up. You can also remove the fuel pump relay and jumper the main power connections to run the pump continuously for diagnosis, or supply a separate 12V sounce to the "G" terminal on the ALDL connector to power the pump. However, applying power to the "G" terminal requires having a good relay installed, since power will have to route through the normally closed contacts of the pump relay to reach the pump.........

×

Add Your Answer

Uploading: 0%

my-video-file.mp4

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

×

Loading...
Loading...

Related Questions:

1 Answer

I have a 2006 audi a4 3.0 when temperature outside drops below 40 degrees it will not start ,when the temperature outside gets around 45 degrees it starts and runs with no problem . screen reads ok


I assume from the question that the engine is cranking over but will not start. Hence there is no issue with the starter motor on a very cold start.

At 40 degrees F you are getting closer to freezing. When this happens again I would check the operation of the fuel pump.
Take the fuel cap off the fuel tank and have someone switch the ignition on and off a few times. (just the ignition - don't start the engine up). Turn it on for 10 seconds or so and then off. If you listen at the fuel filler opening with the cap off you will be able to hear if the fuel pump starts and stops. If it is working it should start and then stop a few seconds later each time you switch on the ignition because the computer shuts it down in a few seconds if the engine is not started.

If the fuel pump is operating I would be looking for some electrical gremlins. You would need to check that the fuel injectors are getting power and that the spark plugs are also.

Ideally you would need to a quality scan tool connected to the car when you have this very cold no start condition whilst trying to start the car to see what faults may be present because it should pick up some malfunction if the start problem goes away when the temp rises a few degrees over 40F.

Jan 02, 2016 | Audi Cars & Trucks

1 Answer

1994 dodge b150 van 3.9 liter will just about start when 30 degrees outside. Sometimes it won't. 40 degrees starts every time


What is the weight of the oil? Heavier oil will cause a sluggish start/spin in cold weather. 15W40 is heavy. This can kill a battery in no time. Other problems are related to hot/overheated problems.

Dec 31, 2014 | Dodge Cars & Trucks

2 Answers

When its cold my lincoln will not start till after i try for 15 min fuel pump sounds like its sputters , but if it is warm it will start no promblem....


Hello.
If the outside temperature is below 32 degrees, your battery loses as much as 15% of the amps that are responsible for turning the engine over.
On your battery you should have a sticker that shows a rating for "Cranking amps," ( CA ) above 32 degrees, and "Cold crancking amps" ( CCA ), below 32 degrees. Your car most likely needs atleast 700 CCA.

Also, if you do not have a maintenance free battery, ( It should say right on the sticker if it is. ), you may want to check the levels in your battery. If the cells are low it will prevent the battery from reaching a full charge.

I hope this helps you

Mar 08, 2011 | Lincoln Continental Cars & Trucks

1 Answer

1994 camaro over heating


First, check to make sure your antifreeze level is full. If it is low, top it up and look for any leaks. Leaks may be more apparent with the engine running at normal operating temperature.

If thats OK, Check to see if your rad fan is turning on once it gets to around 100 degrees.

If thats OK, i would suspect a stuck thermostat.

Mar 28, 2010 | 1994 Chevrolet Camaro

1 Answer

98 Dopdge Caravan won't start when temperature around freezing . When outside temperature rises one or two degrees it will start on first try


The coolant temperature sensor will report the engine temperature to ECM so it can send signal to open the cold start valve. If the sensor is not reporting correct temperature, the ECM won't tell the cold start valve to open for extra fuel to start hence the car is not start. Replace the coolant temperature sensor will take care of the symptom.

Nov 10, 2009 | 1998 Dodge Caravan

1 Answer

My car will not start in -7 degree C. is that cold enough outside for my car not to start ? When i plugged it then it starts. Can the antifreeze be too weak for this problem to arise or something else to...


19deg F is pretty cold.... but alone shouldn't prevent your vehicle from starting.

"Plugging in" the vehicle simply warms the engine oil in the block.

Look into changing your motor oil. It is the most likely culprit - not allowing the starter to turn the engine (like walking through mud)

I would suggest a synthetic oil if you are in this climate most of the year.

Better low temperature performance. Synthetics flow freely at subzero temperatures, pouring easily at -40 or -50 degrees F. where ordinary oils turn to molasses. This makes for easier cold starts and provides faster upper valvetrain lubrication during the first critical moments when most engine wear occurs.

Thanks for using FixYa - a 4 THUMB rating is appreciated for answering your FREE question.

Oct 10, 2009 | 1998 Mercury Mystique

2 Answers

My Jeep Cherokee 95 Radiator temperature is always hot


100 degrees f? That is way too cold Either you have the wrong thermostat or it is wide open. 180 degrees is nominal and give you the best performance.. With AC on, expect 190 to 200 degrees. We are talking farhrnheit and not ccelsius, correct?

Jun 14, 2009 | 1995 Jeep Cherokee

2 Answers

2000 VW Beetle will not start in cold, runs fine above 40 degrees


I was just reading the owners manual for my 2000 beetle and it says the diesel fuel has a problem with the wax separating from it below 40 degrees. Put the car in a warm garage and it will start.

Jan 16, 2009 | 2000 Volkswagen Beetle

2 Answers

1991 Camaro


not a oo2 but maybe a IAC (idle air controll ) you should try and clean it with carb cleaner before replacing it.

Sep 17, 2008 | 1992 Chevrolet Camaro

Not finding what you are looking for?
1994 Chevrolet Camaro Logo

113 people viewed this question

Ask a Question

Usually answered in minutes!

Top Chevrolet Experts

yadayada
yadayada

Level 3 Expert

60667 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

21936 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

6811 Answers

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

Answer questions

Manuals & User Guides

Loading...