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7 votes

My BMW 325xi smells like gas

The fact that you can smell fuel in the exhaust is a strong indication that the engine is running rich. This means that there is more fuel than required by the engine. There are many things which ...
Zaid's user avatar
  • 39.2k
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 ...
Zaid's user avatar
  • 39.2k
6 votes

Startup problems: low idle RPM and stall on pressing the accelerator

Not familiar with your vehicle/engine specifically, but familiar with carbed engines in general. I would think the #1 thing to look at would be the choke. Pumping before starting a carb vehicle is ...
rpmerf's user avatar
  • 8,403
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 ...
zipzit's user avatar
  • 6,539
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 ...
Martin's user avatar
  • 8,458
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 ...
SteveRacer's user avatar
  • 12.4k
5 votes

Engine hesitates and stalls when warm

The stalling issues point toward problems with an engine control system (air, fuel, or spark), but again short of replacing the fuel pump, you have already replaced the parts most likely to cause ...
MooseLucifer's user avatar
  • 6,007
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 ...
dlu's user avatar
  • 14.5k
5 votes
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08 Silverado 5.3 rough idle and dark cold start exhaust

First of all, the 5.3l engine (could be all of the Vortec LS engines, don't know) is thirsty. It drinks a bit of oil. Be aware you could be looking at up to 2 quarts between oil changes. I don't know ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
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 ...
tlhIngan's user avatar
  • 12.2k
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 ...
tlhIngan's user avatar
  • 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 ...
dlu's user avatar
  • 14.5k
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?
Cliff's user avatar
  • 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. ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
4 votes

Is a +/- 10-15 rpm idle fluctuation normal?

Completely normal. Nothing to worry about
cano's user avatar
  • 823
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 ...
HandyHowie's user avatar
  • 25.4k
3 votes

My BMW 325xi smells like gas

Sounds like a possible evaporative system issue involving the purge valves that vent fuel vapor from the gas tank. If the OBDII -on board diagnostic code that triggers the check engine light is P0440 ...
Old_Fossil's user avatar
  • 3,962
3 votes
Accepted

Emissions Problem: Lambda AND CO Slightly High on my 98 Mazda 626

The average gas engine exhausts between 1 and 1.5 CO during normal combustion at stoiciometric mixture (lambda 1.00). The catalysts is expected to burn this excess CO. So if there is .6% at the ...
Fred Wilson's user avatar
  • 11.6k
3 votes

Emissions Problem: Lambda AND CO Slightly High on my 98 Mazda 626

The data doesn't support it You measured your coil resistances to be within spec You measured your wire resistances to be within spec You've already replaced the plugs with ones that require less ...
Zaid's user avatar
  • 39.2k
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 ...
Cc Dd's user avatar
  • 2,879
3 votes
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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 ...
3Dave's user avatar
  • 3,149
3 votes

Black water from exhaust, cylinder misfire and rought idle

Solved, it was a fuel injector that sprays extra gasoline. Cylender 1 was the almost the only one that misfires although others does every now and then. The situation becomes worse when I add ...
Aus's user avatar
  • 276
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 ...
Zaid's user avatar
  • 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 ...
Ben's user avatar
  • 10.7k
2 votes

cause of Rough / fluctuating RPMs in low RPMs

Check engine fresh air intake hose, look for cracks in the bellows region in the middle.
Bogus Bear's user avatar
2 votes

Rough Idling in Citroen C4

Unfortunately we're not able to provide shopping assistance here as it becomes out of date too quickly, and is too localised. Your best bet is to try something like 'checkatrade', or ask around ...
Nick C's user avatar
  • 28.8k
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 ...
Arturs Bolsunovskis's user avatar
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 ...
Hutch's user avatar
  • 61
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 ...
zipzit's user avatar
  • 6,539
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 ...
Zaid's user avatar
  • 39.2k

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