"duurtlang" (duurtlang)
07/12/2015 at 19:10 • Filed to: None
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"duurtlang" (duurtlang)
07/12/2015 at 19:10 • Filed to: None | 0
| 22 |
Oppo, I need your advise. My !!!error: Indecipherable SUB-paragraph formatting!!! hesitates quite a lot while accelerating. Especially around the 2700-3300 rpm range. I’ve got another car with an identical drive train (‘88 gti) that accelerates smoothly, so I know how it should behave. What could cause this, and what can I do?
My first thought were the spark plugs. The are only 6k km (but 2 years) old, just like the air and fuel filter. Spark plug cables are 3.5 years/16k km old. This leads me to believe all this stuff is probably too new to cause such problem, but that’s just a guess.
The car drives just fine at a constant speed, even within the 2700-3300 range. Starts and idles fine too.
davedave1111
> duurtlang
07/12/2015 at 19:23 |
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Vacuum leak? Injectors? Or that old staple of the inexplicable problem, a bad earth connection.
4muddyfeet - bare knuckle with an EZ30
> duurtlang
07/12/2015 at 19:24 |
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Is it the 1.6 or 1.9?
DrJohannVegas
> duurtlang
07/12/2015 at 19:37 |
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I assume it has a distributor? Maybe the ignition advance is off? The hesitation could be a distributor which isn’t advancing the spark timing as the engine speeds up.
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duurtlang
> 4muddyfeet - bare knuckle with an EZ30
07/12/2015 at 19:40 |
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1.6
jkm7680
> duurtlang
07/12/2015 at 19:46 |
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PCV maybe.
JGrabowMSt
> duurtlang
07/12/2015 at 19:51 |
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Pull the plugs and check them, also check fuses, wiring and all gounds. Age and condition do not always line up in any normal sense.
Hesitation makes me think something along the lines of fuel delivery or air intake issues. As has been stated, pop off the distributor cap, clean it, check the plug wires, check the plug gaps, check fuel pressure, and the intake for debris.
Most importantly though, is the engine hesitating, or is it just hesitating to speed up? Clutch could be slipping a hair, or the trans could be an issue, I recall you mentioning a trans issue not long ago...
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4muddyfeet - bare knuckle with an EZ30
> duurtlang
07/12/2015 at 19:53 |
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The air flow sensor and engine coolant temp sensor are supposedly problematic on that engine at age. A compression test and air/vacuum leak test wouldn’t go amiss.
Was the 1.6 built for leaded petrol? Valve seats may be past their best depending on your mileage.
DogonCrook
> duurtlang
07/12/2015 at 19:56 |
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I’d check the spark plugs anyways to get a read on how it’s running. There really isn’t enough information without at least knowing if it’s rich or lean.
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duurtlang
> JGrabowMSt
07/12/2015 at 20:18 |
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There’s no trans problem I’m aware off, the clutch was a problem. The PO replaced it just before I bought the car. He did a very shitty job, and I had a shop redo his work. It shifts and clutches great now. The rev problem happens in every gear, at the same rpm.
The engine runs fine at 4000 rpm on the highwayhighway for hours, at constant speed. I drove it 500 km this weekend. Only when accelerating you can feel it wants to rev but it’s held back. Especially between 2700-3300 rpm. Above 3500 it will accelerate decently smooth. Not great, but relatively okay.
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duurtlang
> 4muddyfeet - bare knuckle with an EZ30
07/12/2015 at 20:23 |
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Engine coolant meter shows minimum temperature even after 2 hours on the highway. But that’s hardly different on my gti (1.6), which does accelerate as it should.
Not sure about the leaded gas. I do believe there’s an unleaded only sign at the gas cap. Car has 193k km.
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DogonCrook
> duurtlang
07/12/2015 at 20:25 |
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Forgot to say check the tps sensor on the throttle, that looks like a Bosch. That sensor wears, it’s 3 fingers on running a cross a circuit board. The idle line and part throttle lines wear out first and they can be visually checked. There is usually no other symptoms besides bucking or hesitation.
Edit: not sure about yours, but on my car which is a bit older but similar system, unplugging the tps is the easiest way to check. It will run like shit but there won’t be a dip anymore. It wears out at the rpm range the car is driven the most.
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traitor joe
> duurtlang
07/12/2015 at 20:25 |
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Sounds like an ignition related problem. Check your spark plug wires, cap, and rotor. Specifically, the connections between the wires, distributor, and plugs are often weak. Your plugs are probably fine but your wires are just old enough to be suspect.
Otherwise, I would suspect a distributor problem since your symptoms are indicative of very retarded timing. Try advancing your timing a few degrees from stock, and test your ignition control module if possible.
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4muddyfeet - bare knuckle with an EZ30
> duurtlang
07/12/2015 at 20:36 |
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Maybe the temp sensor has gone on both of them... ¯\_()_/¯ I’d get a compression test done though, and find out where your AFS sensor is and give it a quick spit shine or just replace it for good measure. The car owes you nothing at 193,000 km, so I would swap easy parts between the two cars as a systematic way of finding a solution. Probably not what you want to hear, and certainly not efficient, but at least you’ll then have a fixed car with minimal expenditure apart from your own time. AFS first though, I think there be monsters in dat sensor.
DasWauto
> duurtlang
07/12/2015 at 21:54 |
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Not getting up to temperature sounds like a thermostat that’s broken and not resisting flow of coolant, therefor overcooling the engine.
As for the hesitation, if the ignition system is all up to snuff, I’d suggest the injectors might be at fault. If the CTi and GTi are both 1.6s maybe ask your mechanic to switch the injectors between them and see if that can nail the issue down.
cbell04
> duurtlang
07/12/2015 at 22:41 |
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I would definitely pull the plugs and get a read on them just google readings spark plugs youll get lots of help. I had a friend that had your same symptoms and we found oil on 2 of his plugs. Sucked because it ended up being an expense repair but at least he didn’t keep letting it slide and blow the motor. Good luck
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DisplacementForDayz, ironically lusts after a Honda Grom
> duurtlang
07/12/2015 at 23:56 |
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Sounds like a fuel delivery issue. I would start with the easy stuff like checking/replacing the fuel filter and then the fuel pump if(when) replacing the fuel filter doesn’t work. Also check your fuel injectors.
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DisplacementForDayz, ironically lusts after a Honda Grom
> DisplacementForDayz, ironically lusts after a Honda Grom
07/12/2015 at 23:59 |
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This is what I would do for a carbureted car, but since there is an ecu involved here, sensors could also be the problem, but then one would assume that you would get a check engine light or something... at least if a sensor failed.
PetarVN, GLI Guy, now with stupid power
> duurtlang
07/13/2015 at 04:48 |
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loss of pressure in the turbo system? to me it sounds like the car is "stumbling" and losing boost
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duurtlang
> PetarVN, GLI Guy, now with stupid power
07/13/2015 at 04:51 |
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I wish it had the ability. It’s a NA engine. There’s no turbo.
BiTurbo228 - Dr Frankenstein of Spitfires
> duurtlang
07/13/2015 at 04:54 |
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If they use the same temp sensor as a 106 GTi (they may well do I’m thinking), that going pop is a common cause of similar symptoms as dodgy signals coming from that change the fuelling...
I don’t think this shows as a change in the actual temp gauge though, although I’m not sure...
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PetarVN, GLI Guy, now with stupid power
> duurtlang
07/13/2015 at 04:57 |
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you’re telling me the pugs were NA?!
...
...
Jeez I feel stupid now... I coulda sworn they were turbo’d!
second guess would be a vacuum leak somewhere?
Cé hé sin
> DisplacementForDayz, ironically lusts after a Honda Grom
07/13/2015 at 05:05 |
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This is from long before the era of check engine lights!