7
votes
Solstice! Car starts to run rough after hitting the gas, intermittently.
Regarding the tangent, yes, an ill-fitting dipstick can be the cause of a vacuum leak.
Pulling out the dipstick is a way mechanics can figure out if the car is suffering from unmetered air/vacuum ...
- 39.2k
6
votes
1996 Chevy K1500 Silverado ZZ4 5.7L - Rough Idle, Plug Damage, Overheating, EGR
I see the following possibilities:
Like dlu said: wrong range of spark plugs. Perhaps you can try some colder ones. When trying this: be sure to check the spark plugs soon, a too cold spark plug ...
- 8,488
6
votes
Accepted
2015 Honda Mobilio - Car shakes when started
If I had to guess this sounds like a four cylinder engine, with one or even two cylinder's misfiring. Best guess is a problem with either a spark plug wires, or an ignition module. I'm looking at ...
- 6,569
6
votes
Accepted
Rough Idle & Stall While Stopped
I would check the idle air control valve, or the IAC.
This might likely create the exact symptoms you describe. Determining if it's working properly is a bit of a chore for a DIY person, but this is ...
- 12.4k
5
votes
Accepted
Rough idle + slow acceleration + engine dying after spark plug change
Probably not. Engines are pretty tough. But pull a plug before you drive anymore and check for mechanical damage. Pistons hitting plugs would not be good.
Also double check your plug wires and make ...
- 14.5k
5
votes
Accepted
Engine's RPM drops right after start and after letting off the gas
Sounds like trouble with the idle speed control valve. On the '93 Miata, it looks like this:
This little guy, when working properly, will let enough air into the engine to keep the engine alive when ...
- 12.2k
4
votes
1996 Chevy K1500 Silverado ZZ4 5.7L - Rough Idle, Plug Damage, Overheating, EGR
My first thought here is to tackle the problems methodically, one at a time.
The one that sounds most significant to me is the plug 5 damage – from what you've said it sounds like detonation (aka ...
- 14.5k
4
votes
Rough idle + slow acceleration + engine dying after spark plug change
Don't worry about engine damage. The main difference between these 2 spark plugs is the length, the one you used is shorter. That means 2 things:
the spark was not created in the best place, meaning ...
- 12.2k
4
votes
Astra MK6 - when warm, rough idle and shudders while accelerating
I don't know that particular car well, but maybe a vacuum leak? Perhaps it's at the intake manifold, and worsening as the parts warm up, expand, and mating surfaces change shape?
- 41
4
votes
Car engine vibrates vigorously with air conditioning on at idle speed
I'll take a swing at this ...
The engine in your car, whether it's the Single Overhead Cam (SOHC) or Double Overhead Cam (DOHC) version, has a vacuum actuated (non-electronic) idle air control valve. ...
- 160k
4
votes
4
votes
Timing sounds off, how do I confirm this?
When changing the timing belt, it is the valve timing that can become displaced if the belt is not put back in the correct position. To accurately check this is a simple visual check. However, to do ...
- 25.5k
3
votes
Rough idle problems on 93 Miata
list of things to check and some questions
the IAC valve might be giving the correct readings but is it stiff or sticking?
does any of this happen when it is warm outside as in during summer?
when ...
- 2,879
3
votes
Accepted
Solstice! Car starts to run rough after hitting the gas, intermittently.
So, here's the difference between the Solstice and Malibu dipsticks (both 2.4L LE5)
The shorter one with the larger diameter, bright yellow handle is from the Solstice. Fortunately it was still in ...
- 3,159
3
votes
Accepted
Does this harmonic balancer / crankshaft pulley look damaged?
Yes, that's the rubber damper developing a crack on the crank pulley. It will need to be replaced.
As the name suggests, the primary purpose of the harmonic damper is to help counter torsional ...
- 39.2k
3
votes
Accepted
Idle speed is wrong after replacing battery (2006 Camry)
You need to clean the throttle and perform an idle relearn. Unfortunately there isn’t a reset function in Techstream or other software, you can only do it manually. This is the way I do it, some ...
- 10.7k
2
votes
Startup problems: low idle RPM and stall on pressing the accelerator
initially press the accelerator slowly to the floor. Then wait a few seconds before cranking. Pressing the accelerator slowly uncocks the auto choke without injecting fuel via the accelerator pump ...
- 61
2
votes
Why does my engine vibrate at idle only when I have the AC on?
The engine has no power at idle, it would be same as if you switch in gear and slowly release a clutch. Automatic idle control will try to keep it running, and it will vibrate. Some tiny 1L cars with ...
- 1,438
2
votes
Idling problems on 2004 Ford Mustang 4.6L V8
Possible, but generally air intake and vacuum leaks will often set an error code in the OnBoardDiagnostics (OBDII) system.
We're assuming you've read the codes and came up with no faults. If you've ...
- 6,569
2
votes
Accepted
Idling problems on 2004 Ford Mustang 4.6L V8
With the hunting idle and the car going 30-35 mph without touching the gas pedal, it looks like a classic case of unmetered air making its way to the intake manifold.
One way to confirm this is the ...
- 39.2k
2
votes
2002 Jeep Grand Cheerokee Laredo hesitate/jerking + multiple CEL codes
As Moab pointed out, your issues are very "generic", meaning there's a number of things that could be causing them. Here's what you do:
When the check engine light comes on, it means the computer has ...
- 12.2k
2
votes
2002 Jeep Grand Cheerokee Laredo hesitate/jerking + multiple CEL codes
Regarding the O2 sensor codes. Check fuse 16 in the under hood fuse box. It's likely to be blown. The only point all four sensors have in common is the fuse. If the fuse tests good I'd pull up the ...
- 10.7k
2
votes
Why is my car missing, surging, shaking and rpm's idling radically
your problem is too hard to figure on the info provided, however no worries. My advice for the cheapest solution is to remove the intake pipe to the throttle body and drown the throttle body butterfly ...
- 66
2
votes
Accepted
What could be causing strange idling behaviour on twin carb motorbike?
Yes, there are some tests
It sounds like you are describing an air leak between your carburetor and cylinder head. This is called unmetered air. When you have air going into the combustion chamber ...
- 32.9k
2
votes
Car engine stutters when hot, and sometimes stalls
For anyone reading this. I had water in my gasoline tank.
- 41
2
votes
Accepted
Mazda 3 really bad idle related to fuel pump
I would say that if you were able to take the car to the redline in 3rd gear, the fuel pump is providing sufficient pressure as the demands on the fuel pump are greater at full throttle than at idle.
- 23.4k
2
votes
Accepted
Do I have a fuel pressure or injector problem Part 2
Sounds like your pressure fuel pump is 100%. Pressure regulator could be off.
If your above 30psi after 5 mins you are probably OK.
The pressure regulator works by bleeding pressure back to the tank....
- 181
2
votes
Should the EGR be activated at idle?
At idle, your EGR valve should be closed (read: not activated), allowing no exhaust gas to get into the intake air. At idle, any exhaust blended in with the fresh air might indeed cause your engine to ...
- 171
2
votes
Honda dirt bike with clone engine lots of problems
Your bike is full of deposits -- carbon and varnish -- that are byproducts of petrochemical fuel and years of combustion. Deposits clog fuel lines and carburetor jets, cause piston rings to stick, ...
- 2,127
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