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1 Answer

Could a pick up coil cause the engine to miss and stumble under load after the engine is very warmed up?

As the component gets hot it could become unstable and stop working. Same thing with a coil or ignition module.

Oct 09, 2015 | Cars & Trucks

1 Answer

I have a 2008 chevy hhr, starts fine and idles

Have you replaced the spark plugs or coil packs? A lot of times spark plugs will only miss once a load is put on them. Here are some tips to help you narrow it down. All you need is a screw driver and a code reader.
First, is your check engine light on?

----> if yes, try to get the code it is throwing

is the code current?

----> if no
1. Pop the hood
2. Remove the air filter box cover and inspect the filter
---> is the air filter clean?
If no, replace the air filter
If yes, remove the engine cover -

3. Find the fuel rail located toward the back of the engine bay and find all 4 injectors.
Place your thumb over the end of a long flat blade screw driver, place it carefully on each injector, and place your thumb on your ear. With the engine running, listen for fires from the injector
-----> are all 4 injectors firing rapidly at the same rate?
----> if yes, start with replacing all 4 spark plugs
----> if no, replace the fuel injector that is not firing

If yes ---> is the code for an engine misfire?

See above instructions

if no ----> is the code for throttle body position?

if yes ---> Replace the throttle body position sensor and perform the relearn process via tech II scan tool.

These are the most common issues with misfiring with engines, hope it helps or leads you in the right direction.

Oct 01, 2014 | 2008 Chevrolet Hhr

3 Answers

#2 misfire fouled spark plug in sunfire

yes bad leads will be one of the faults
run the motor in the dark raise the bonnet look for sparkle trails
on the leads

coil pack could be faulty

compression test will tell if it is a leaky valve

back fire can be running lean or timing



Mar 31, 2017 | 1997 Pontiac Sunfire

1 Answer

My 4.2 runs good at idle but when under load it loads up and stops running then runs again

Yes. Gebback to us. Check for timing advance when you check timing. Also check carb mounts for leaks.

Oct 17, 2012 | 1990 Jeep Wrangler

1 Answer

93' cavalier, very rough running. Missing badly at all speeds and loads, including at idle in park. changed plugs and no change in symptons. Is this an injected motor (4 cyl)?

Yes, this is fuel-injected engine. Look for vacuum leaks and then consider replacing the ignition coil (located on back side of the motor). Just follow the spark plug wires and you'll find it.

Dec 28, 2010 | 1993 Chevrolet Cavalier

1 Answer

My 1994 Astro EXTAWD 4.3L misses, runs rough,lacks...

sounds like you have either a bad head gasket or a cracked head

May 19, 2010 | 1995 Chevrolet Astro

1 Answer

Missing under load, number three cy,inder was

Next step is the camshaft position sensor.

Mar 21, 2010 | 1999 Suzuki Vitara

1 Answer

Engine Miss on 96 camaro possibly Ignition related?

yes coil or the power washer blew a vacuum line apart..check for vacuum leaks good luck

Nov 22, 2008 | 1998 Mitsubishi Galant

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