NewStats: 3,263,990 , 8,182,176 topics. Date: Monday, 09 June 2025 at 08:06 AM 4e6f14

Thank you

Yes I was advised, but the rattling isn't even the major issue, so I went to another shop, someone suggested their name on nairaland here, shop name is Nuel and partners auto ltd at adebowale Akure, the car was scanned and he said my crankshaft position sensor wires were connected wrongly, he corrected it but the engine was still taking longer than usual to start up and was still vibrating in drive and misfiring, I was told to test drive it for the day and see if it would start the next day and so I left
The next day it would not start and I called him, he sent one of his apprentices to my house to have a look, the crankshaft code was still there but then the apprentice took out ignition coil on the first plug, stuck a nail and had the other side of the nail on the engine to confirm spark, there was no spark, he did it for the next ignition coil, there was no spark, so he called his boss, and the boss told him to check the fuses.
The apprentice took out my fuses one after the other and stuck them back in, told me none of the fuses was bad, after the check, he started the car and the engine came up immediately, no hard starting, sounded very fine, we drove it to their workshop and it drove really smooth, responded properly to the gas pedal and d vibration was gone, that was two days ago, yesterday I drove a total of 17 miles and the engine ran great, I'm still not so sure the problem is gone but they habe definitely touched where the issue came from, I didn't buy anything only paid for their service.
I am happy and hope this issue never cimes back, in all of this what I noticed is after the first day the issue if hard starting went away the next day (yesterday) I discovered my fan wasn't running when I started the car (the fan is direct so it should always run) the same shop sent me their rewire to fix the fan and the relay was damaged, burned, that's it.
Could fuses not ing well or a burned fan relay cause issues like hard starting/no start/no spark, engine vibration at idle when it started, and engine cut outs?
@jceeesquare, thanks for replying, the engine isn't GDI it's lambda V6 DOHC engine, an older engine before GDI came.

jceesquare:

I believe you were advised to check the timing chain tensioner for the early morning rattling and not the timing itself.
For the late starting issue, your rewire might be right. If the fuel line does not hold pressure when parked overnight, you'll have delayed starting issues and would have to change your complete fuel pump assembly.
Is yours a GDI engine?

Happy new year fellow Nigerians and nairalanders, I'm still on my car's issue, I appreciate everyone who has commented, i met a mechanic who told me my car engine didn't jump timing, and advised to find a good electrician, my right wheel speed sensor was fixed, the wire was damaged, the abs light went out and my speedometer is now working, I don't know if this right wheel speed sensor and non functional speedometer was responsible for my random engine cut outs which I had before.
The issue I have left is with the hard starting, it will not start in the mornings, I called my mechanic he came and took out the vacuum hose connected to the throttle body, the he added a little fuel on the throttle body and told me to start the car, and the car started once, he then told me to consult an electrician.
The electrician I consulted first told me to get a new fuel pump, but I told him I had bought a new one in the past, then he said to change the whole fuel pump assembly, I believe nothing is wrong with my fuel pump assembly, and I don't really trust all these quick judgment without a definitive test.
After the car has been started by throwing some fuel into the throttle body in the morning, it starts up again itself but it cranks for a long time, so the hard starting still persists, it never starts itself in the mornings without adding fuel on the throttle body, I need your always valuable suggestions, I have to add that when this car is started it now makes an usual exhaust sound like a backfire, I've been told my exhaust pipe leaks but I'm certain that's not the case because this funny sound came with this hard starting, thanks for your replies.

Akinfrank:
I have the 2009 V6 3.3l Hyundai sonata and it has been making a rattling sound for about 3 seconds at first start up only, some say it's the timing chain/tensioner, last week it would drive smooth and cut out and sometimes refuse to restart until a few minutes have ed, took it to get checked and it had code for crankshaft position sensor, had that replaced with a new one (not a Hyundai made as the Hyundai office in Lagos said they didn't have it, a friend bought it for me at ladipo) replaced but the problem still persisted.
Took it back again and it had code for camshaft position sensor, had those replaced ( also new) and the random engine cutouts stopped but the car started shaking if on Drive and not moving, and it also didn't respond quickly when the accelerator pedal was depressed, it'd increase rpm but not increase speed accordingly/respond fast enough, the running was rough and this was new.
Took it back again and it was showing P0335, the mech said it has probably jumped timing( at this point the mechanic was already getting frustrated), drove it back home and parked it, and it won't restart, cranks but will not start, do you think it's the timing chain? If it is, can you recommend a good brand and where to buy? I need to fix the car and I don't know what mechanic or electrician to trust anymore, these sensors and other things I bought which appeared to be guesses from technicians I visited already cost me over 120k, I've been to three mechanics/rewire, the first mechanic Even had me buy a new fuel pump.
I need your advice on what to do and maybe a recommendation about a good mechanic/rewire based in Akure

Thank you, I'll update when there's any development.

jceesquare:

Take the valve cover out and turn cylinder 1 to top dead center (follow engine mark on harmonic balancer). If the timing is off even by a tooth, then your chain has slacked and tensioner bad.
Any mechanic that is comfortable working on a chain driven V6 engine should be able to set your timing right.

Thank you for your reply, is there a way to confirm its the timing chain and or tensioners? I am thinking the head and covers on the side can be taken down to see if the engine has jumped timing, and if this is really the case I have read timing chain replacing has to be done by a person who really knows what he's doing as there can't be mistakes, I don't know which mechanic to trust with such a Job, should that be the case, thanks again

jceesquare:

The initial diagnosis for stretched chain and bad tensioners were right.
Those engines are known to have tensioner issues.
Replace both tensioners, replace chain, replace all chain guides and your issues should be resolved.
Try to stick to recommended oil weight and change your oils regularly henceforth if you've not been doing that.

Thank you @kingreign, the electrician checked the continuity to the crankshaft position sensor wire with a test lamp the last time I visited, I don't know what the pulsator ring is, so far these are the codes the electricians have told me they saw after scan, firstly it was P0685 (about the main relay) it was checked and that went away, then it was P0011 and then P0335, I don't know if it helps to add that this problem began the day I noticed my speedometer worked intermittently, sometimes it doesn't work and then later it picks up, so I have a wheel speed sensor code, that was the first code, after these electricians have touched my car my speedometer permanently stopped working, maybe that's not the reason for the crank no start I have now but this is the car's history.

I have the 2009 V6 3.3l Hyundai sonata and it has been making a rattling sound for about 3 seconds at first start up only, some say it's the timing chain/tensioner, last week it would drive smooth and cut out and sometimes refuse to restart until a few minutes have ed, took it to get checked and it had code for crankshaft position sensor, had that replaced with a new one (not a Hyundai made as the Hyundai office in Lagos said they didn't have it, a friend bought it for me at ladipo) replaced but the problem still persisted.
Took it back again and it had code for camshaft position sensor, had those replaced ( also new) and the random engine cutouts stopped but the car started shaking if on Drive and not moving, and it also didn't respond quickly when the accelerator pedal was depressed, it'd increase rpm but not increase speed accordingly/respond fast enough, the running was rough and this was new.
Took it back again and it was showing P0335, the mech said it has probably jumped timing( at this point the mechanic was already getting frustrated), drove it back home and parked it, and it won't restart, cranks but will not start, do you think it's the timing chain? If it is, can you recommend a good brand and where to buy? I need to fix the car and I don't know what mechanic or electrician to trust anymore, these sensors and other things I bought which appeared to be guesses from technicians I visited already cost me over 120k, I've been to three mechanics/rewire, the first mechanic Even had me buy a new fuel pump.
I need your advice on what to do and maybe a recommendation about a good mechanic/rewire based in Akure

I have the 2009 V6 3.3l Hyundai sonata and it has been making a rattling sound for about 3 seconds at first start up only, some say it's the timing chain/tensioner, last week it would drive smooth and cut out and sometimes refuse to restart until a few minutes have ed, took it to get checked and it had code for crankshaft position sensor, had that replaced with a new one (not a Hyundai made as the Hyundai office in Lagos said they didn't have it, a friend bought it for me at ladipo) replaced but the problem still persisted.
Took it back again and it had code for camshaft position sensor, had those replaced ( also new) and the random engine cutouts stopped but the car started shaking if on Drive and not moving, and it also didn't respond quickly when the accelerator pedal was depressed, it'd increase rpm but not increase speed accordingly/respond fast enough, the running was rough and this was new.
Took it back again and it was showing P0335, the mech said it has probably jumped timing( at this point the mechanic was already getting frustrated), drove it back home and parked it, and it won't restart, cranks but will not start, do you think it's the timing chain? If it is, can you recommend a good brand and where to buy? I need to fix the car and I don't know what mechanic or electrician to trust anymore, these sensors and other things I bought which appeared to be guesses from technicians I visited already cost me over 120k, I've been to three mechanics/rewire, the first mechanic Even had me buy a new fuel pump.
I need your advice on what to do and maybe a recommendation about a good mechanic/rewire based in Akure, Ondo state.

I have the 2009 V6 3.3l Hyundai sonata and it has been making a rattling sound for about 3 seconds at first start up only, some say it's the timing chain/tensioner, last week it would drive smooth and cut out and sometimes refuse to restart until a few minutes have ed, took it to get checked and it had code for crankshaft position sensor, had that replaced with a new one (not a Hyundai made as the Hyundai office in Lagos said they didn't have it, a friend bought it for me at ladipo) replaced but the problem still persisted.
Took it back again and it had code for camshaft position sensor, had those replaced ( also new) and the random engine cutouts stopped but the car started shaking if on Drive and not moving, and it also didn't respond quickly when the accelerator pedal was depressed, it'd increase rpm but not increase speed accordingly/respond fast enough, the running was rough and this was new.
Took it back again and it was showing P0335, the mech said it has probably jumped timing( at this point the mechanic was already getting frustrated), drove it back home and parked it, and it won't restart, cranks but will not start, do you think it's the timing chain? If it is, can you recommend a good brand and where to buy? I need to fix the car and I don't know what mechanic or electrician to trust anymore, these sensors and other things I bought whjxh appeared to be guesses from technicians I visited already cost me over 120k, I've been to three mechanics/rewire, the first mechanic Even had me buy a new fuel pump.
I need your advice on what to do and maybe a recommendation about a good mechanic/rewire based in Akure, Ondo state.