2
votes
1answer
153 views

Determining active gear from OBD2 for Ford Fiesta

I am trying to to write an app which advises the driver to change gears and do some other driving quality assessments. For this purpose I need to determine the RPM and currently active gear in a ...
3
votes
2answers
141 views

Fuel Consumption Paradox

I've been trying different driving styles for a while now, in an effort to reduce my fuel economy and tank range. I've found that I get the best results when racing around, as opposed to driving ...
2
votes
1answer
23 views

94 Dodge Ram starts and runs shortly, then shuts down; first happened while driving

Recently, I was driving my truck down the interstate going 55mph when my acceleration stopped as I had my foot on the gas. I had half a tank of gas, battery strong. I pulled over and was able to ...
5
votes
2answers
211 views

2006 Jeep Commander - heat problems

My heater blows cold air at idle. and warms when driving. my temperature gauge goes up when the air is blowing. What could it be?
3
votes
0answers
138 views

Hyundai Santa Fe - Engine Oil Pressure Valve

Does anyone know where a 2007 Hyundai Santa Fe CRDI Engine Oil Pressure Valve is?
6
votes
2answers
245 views

What's involved in getting a piston engine to spin the other way?

I've been thinking about this problem ever since I had to slightly crank my BMW's engine the opposite way to insert a crank-locking pin. What are the fundamental changes required to make an engine ...
4
votes
3answers
72 views

I just patch my tire what's next

I just took my car to the tire shop to patch a tire that kept deflating very slowly. Do I need to get and alignment and balance ?
4
votes
2answers
173 views

What controls O2 sensor/lambda cycling?

I just replaced the lambda on my 98 Mazda 626 GF 2L because it was showing a signal that was constantly pegged lean and I suspected it was defective. After replacing the sensor I took the car for a ...
4
votes
2answers
96 views

Replace Yamaha FZ6 radiator for two smaller ones

I bought the engine of a Yamaha FZ6. I want to use it to run a competition single seater car we are builiding in the university. The engine didn't bring the radiator with it. I would like to ...
2
votes
1answer
65 views

Is the Chevrolet TPI batch fire injection?

I'm looking at a Chevy Tuned Port Injection (TPI) system from a 91 Camaro Z28 with a 350 cubic inch motor. Is the injection on this batch fire (fires all injectors at the same time regardless of the ...
6
votes
2answers
124 views

Is there such as thing as acoustic windshield tint/film?

I was wondering if there was a product like this. Also, here in Canada (and other countries too), tinting the windshield is illegal. What if the film is clear? Would it still be illegal?
4
votes
1answer
112 views

Mist coming out vent and water leaking under dash

When I turn on ac after a while a mist starts coming out and I have a leak under dash 💨 for about a month now. What can it be? Please help
3
votes
1answer
56 views

Is a chuffing sound from a 1999 Saab 9-3 sign of an exhaust leak?

I hear this sound when running alongside curbs or concrete walls with RPMs below 2000. I suspect it's a leaking exhaust manifold gasket, and intend to replace this in the near future. When I try to ...
3
votes
3answers
495 views

2001 VW Jetta 1.8T oil light on, but oil level is full

Basically the situation is as described in the title, the oil light comes on intermittently, but when I check the oil it appears full. What could be causing this?
6
votes
2answers
181 views

1988 Jeep Wrangler - How do I do a DIY alignment?

Have a friend with a '88 YJ. He wants us to tackle an alignment job on it. It's pulling to the right. We can see the rear axle is not aligned and tire rubs on one side. It looks like it might be ...
3
votes
1answer
74 views

Intermittent no start and no crank on Mazda 323 2000 AT

Two months ago, I had a problem on intermittent no start and no crank in my Mazda 323f 2000 AT model. When I brought it to the shop, they found out that the problem was the starter and that the brush ...
2
votes
1answer
59 views

Honda Civic 2004 - Airbag Error code

My 2004 Honda Civic Coupe Manual Transmission has it's airbag light constantly on. Honda just did a recall on them for the Takata airbag issue about 3 months ago. I learned how to get the error code ...
5
votes
1answer
95 views

Inaccurate fuel gauge

Is there anything I can do about my inaccurate fuel gauge? Today it was at the bottom of the red zone, and I put in 9.5 litres and it went up to half a tank, but the tank is 42 litres. I have an ...
11
votes
4answers
615 views

How can I tell if I have bad cats?

No, not that cat! Catalytic converters - or "cats" - have a nasty habit of failing with age. What are the symptoms associated with a cat that's gone bad? Are there any tests that could ...
5
votes
1answer
62 views

Can steering be electrically controlled?

Please see this: http://www.bloomberg.com/features/2015-george-hotz-self-driving-car/ George Hotz claimed he used CAN to control the car by software. I can understand that accelerating and braking ...
2
votes
3answers
146 views

Oil pressure and fuel pressure formula

Can someone give me a formula to calculate Oil and Fuel pressure of a car engine? Consider a small passenger car. I have information like Total distance travelled, speed, rpm, MAF, MAP, Intake Air ...
9
votes
3answers
2k views

Car won't reach operating temperature

Here's a seemingly simple problem - I noticed that the temperature gauge of my mother's 2004 Opel Meriva 1.7CDTI won't ever climb above minimum. I checked the OBD readings to see if it was a defective ...
4
votes
1answer
81 views

Does haveing multiple layers of tint make sense?

I am getting my self a new car, and car dealer is making me choose from different tints. Now I have been searching online what's a good tint color and shade. Along the research, I've read a few people ...
2
votes
1answer
123 views

Calculate tyre pressure of a car from OBD parameters

I want to calculate the tyre pressure of a car from OBD parameters. I don't want to take TPMS or any custom PID for this. One of the indirect method is the calculate: ((w_LF + w_RR) - (w_RF + w_LR)) /...
5
votes
2answers
95 views

Letting Off Gas Forces Open Loop

I noticed something that seems a bit strange to me. Many times when I let off the gas the ECU drops out of closed loop into open loop for about a second. You can see on the graph that this happens ...
5
votes
2answers
111 views

Using regular unleaded gasoline in a Lexus RX330

Is it OK to use Regular Unleaded Gasoline in a 2005 Lexus RX330? In the past I have used Super but am now using Regular. So far no problems.
2
votes
1answer
99 views

Fuel consumption is bad

I currently own a 2010 Honda Civic 1.8L and a 2012 Honda Jazz(Philippines) / Fit (USA and Japan) 1.5L. I just purchased a second hand Jazz/Fit about 2 weeks ago and the mileage is 32xxx. Btw we use ...
2
votes
1answer
43 views

Toyota Camry 2003 drive seat won't move forward

We have a 2003 Toyota Camry. Its driver seat power track won't move forward as it turns to the right after about 1/4 inch movement and cannot go forward. However, it does go backwards all the way. ...
6
votes
2answers
181 views

Engine continues to spin after putting in neutral

I have a 2001 Plymouth Neon, it has a manual transmission. Recently the car has started to not stop the engine when I shift into neutral. If I shift into neutral while moving, the engine will rev like ...
6
votes
1answer
988 views

Car leaks oil when driving, Oil from exhaust pipe

Car leaks oil when driving not while parked. The bottom of the vehicle is covered with oil and there's white smoke coming from tail pipe when driving. It sat and there no oil puddle in garage but ...
5
votes
1answer
135 views

oil level on dipstick

Which way should this dipstick be placed? When placed in with the bend facing towards the engine it gives a different reading from when placed facing the opposite way. There is not a great deal of ...
7
votes
1answer
161 views

1968 Beetle How to adjust adjustable beam

I had the shop install an Airkewld adjustable beam on my 1968 Beetle. How do I now adjust the height of my car? Airkewld seems to have a few how-tos but they're not well written and apply to a ...
3
votes
5answers
152 views

1980s motorcycles and engine size: still good performance?

A buddy of mine is considering a fix it upper road bike for fun and to learn (prior dirt bike rider). I still go by the rule of thumb that 600cc is iffy for beginners but a lot of used 1980s bikes are ...
10
votes
0answers
76 views

1968 Beetle Front Shocks (Koni)

What are the correct size Koni front shocks for a 1968 Beetle at stock height? I purchased the (red) Koni D 80-1787 which Koni's site recommended as a stock shock replacement. My mechanic says ...
5
votes
5answers
202 views

When jump-starting a car, won't there be a huge back current into the dead battery?

So imagine I have car D with the dead battery and car G with the good battery. Initially, both cars are turned off. I hook up car G to car D in the proper order. Before I start either car, won't ...
3
votes
2answers
91 views

What would be better for an engine driving at 60mph or 70mph? I wish to get the most miles out of my engine?

At 60mph my engine revs at 2800RPM and at 70 it's 3200RPM. My qustion is which condition would give the most miles from my engine.
4
votes
1answer
272 views

What are the effects of excessive oil changes on an oil pump? (read description)

I would like to know what the effects on an oil pump are when oil is changed. Obviously after changing the oil filter the engine will run dry without oil pressure for the first few seconds while oil ...
5
votes
2answers
812 views

What is the “dollar bill” test?

One of the questions recently made reference to an exhaust failing the "dollar bill" test. How does one perform it and what does it tell you?
4
votes
1answer
274 views

Do I follow the same recommended tire pressure when I change to nitrogen filled tires?

I am aware of the recommended tire pressure indicated in the car's user manual and in the driver's door. I've been reading a lot about filling tires with nitrogen and a few of the advantages has ...
1
vote
0answers
41 views

12 v RV solar system ground wire size for minmum voltage drop [closed]

I have been too ignorant about wire sizing but now trying to correct it. 280w of panels - 15amp potential max. power for the two - controller (set to 14.4 now) - 12v AGM 200 amp/hr battery. 22 ft new ...
3
votes
1answer
41 views

74 Corvette with slight pop in exhaust

I've got a (new to me) 1974 Corvette with the 5.7 / GM 350 . Dual exhaust. Driver's side exhaust sounds perfect. Passenger's side exhaust has a subtle pop/rattle to it and does not pass the "dollar ...
4
votes
2answers
2k views

How to trigger an idle throttle position re-learn?

My Toyota Vitz 2007 idles roughly and I got advice to clean the throttle body and make the vehicle re-learn the idle by starting the engine and let it idle for some time. My question is, is it ...
3
votes
2answers
261 views

Can a universal catalytic converter be legally fitted to my Prius in California?

My 2006 Toyota Prius with 280k miles is throwing the P0420 code, which means that it (probably) needs a new catalytic converter. I live in California, which makes life much more difficult to replace a ...
1
vote
0answers
60 views

2003 Honda Accord Vibration and noise in engine [closed]

My 2003 Honda Accord is shaking while idling, and every once in a while there is a rattle in the engine like something is loose. I have had it checked out, and replaced all of the engine mounts to no ...
5
votes
2answers
121 views

Water underneath floor carpet - Mazda Protégé 2002

I just bought a Mazda Protégé 2002 and a few weeks later I noticed a damp spot on the back passenger side floor. Very wet and soaked. Later I noticed the smell grew larger and the vapor on the glass ...
1
vote
1answer
39 views

Is there a way to search music in a 2005 BMW 320D Touring

Is there a way to search music in the BMW 320D Touring menu? I also can't scroll through the music list in a cd/dvd. Only lets me scroll through the songs already on screen. How can i scroll ...
4
votes
3answers
672 views

Brakes knock and make springing sounds shortly after starting to drive

I have a 2008 Yaris T3. It's been serviced regularly, and at the last service the brakes (front and hand brake discs) were checked, and skimmed. That was about 4 months ago. About two weeks ago, ...
3
votes
1answer
61 views

Will this panel fit a C4 for possible onboard PC upgrade?

I have a Citroën C4 2005 Petrol. My central dashboard currently looks like this: I figured I can buy the following panel from eBay and easily fit a Nexus 7 Tablet inside it, potentially even write ...
2
votes
1answer
437 views

Getting MIL on a Dodge Grand Caravan 2012 without an OBD device

I have a dodge grand caravan 2012 and yesterday, the check engine light went on. I know there's usually a way to get the error codes without an OBD device... I was able to do this on my old caravan ...
4
votes
2answers
62 views

Tire Pressure Adjustments When Needed

From my understanding there is the recommended tire pressures at the inner part of the drivers door, but I have this question in my head just in case this happens. Say my recommended tire pressure ...

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