throttle delay

[koolfan]

hi. just got the mx5 NA8 recently for a months and i have feel that the car have some throttle delay when i was driving normally and would like to acceleration suddenly. the power did delay for 1-2 seconds before it have response. dont rEALLY know do u guys understand wot i mean.just wondering wots the problem is it?? thanks.

[93_Clubman]

We know what you mean, but given your MX5 is a recent purchase of a 20 year old car, you need to baseline service it, unless you have proof of a recent & comprehensive service. It's best to initially setup the car correctly in terms of checking, adjusting or replacing items, & replacing consumables, & then troubleshoot. Otherwise you can just end up chasing your tail.

[koolfan]

We know what you mean, but given your MX5 is a recent purchase of a 20 year old car, you need to baseline service it, unless you have proof of a recent & comprehensive service. It's best to initially setup the car correctly in terms of checking, adjusting or replacing items, & replacing consumables, & then troubleshoot. Otherwise you can just end up chasing your tail.

hi there. i have recently did the services and have change the drive belts, fix the oil leaks, change the rocker cover gasket, rear brake pads and machine rear rotors, oring for cam sensor, change the engine oil, oil filter and air filter.

[93_Clubman]

Excellent!

Then change spark plugs & spark plug leads. Fuel filter also.

Then you need to check & adjust as necessary a number of other things. For example, given your NA8's issue, is the throttle cable adjusted correctly? I've got a list which I'll look for & post - but in the interim:

For future ref a useful service list from de bounce:

To sum it up in a list and tick it off as they are done.

Replace timing belt, tensioners, cam and crank seals, water pump, hoses and possibly thermostat.
Check/replace the front drive belts
Replace spark plugs
Replace air cleaner
Replace fuel filter
Replace engine oil and oil filter
Replace power steering fluid
Check engine and gearbox mounts
Check radiator top tank and hoses
Replace the coolant
Replace gearbox oil (make sure you undo the correct filler plug on the passenger side)
Replace the diff oil
Check/replace gearbox upper and lower boots
Check the brake pads
Grease the caliper slide pins
Adjust hand brake
Replace brake fluid
Check the front wheel bearings/hub for play
Check clutch slave for leaks under the rubber boot
Replace clutch fluid
Get a full 4 wheel alignment by someone who knows what he is doing
Subaru upper cylinder cleaner
Tyres and tyre pressure
Clean the water/top drains

At the end you know all the servicing is done and as each task is completed you will also have a appreciation of the cars condition.

viewtopic.php?f=18&t=46863&p=588886#p588886

To which he adds:

My list above was provided for a car of average use and I believe still valid as an initial baseline.

To add to the list for a low Km older car I would be cautious of anything made of rubber as previous mentioned.
This includes the brake system (master and callipers) and the clutch system (master and slave) as the seals may have perished through lack of use.
I'm not saying to go out and replace them, regularly check them for any sign of leakage or unusual feel.

Also check:
Suspension bushes and steering/driveshaft boots.
Seals around the rear lights.
The rain rail and roof drains.

Ideally get it up on a hoist and spend some time looking for issues underneath then drive it for a couple of thousand Km and check it again.

[koolfan]

Excellent!

Then change spark plugs & spark plug leads. Fuel filter also.

Then you need to check & adjust as necessary a number of other things. For example, given your NA8's issue, is the throttle cable adjusted correctly? I've got a list which I'll look for & post - but in the interim:

For future ref a useful service list from de bounce:

To sum it up in a list and tick it off as they are done.

Replace timing belt, tensioners, cam and crank seals, water pump, hoses and possibly thermostat.
Check/replace the front drive belts
Replace spark plugs
Replace air cleaner
Replace fuel filter
Replace engine oil and oil filter
Replace power steering fluid
Check engine and gearbox mounts
Check radiator top tank and hoses
Replace the coolant
Replace gearbox oil (make sure you undo the correct filler plug on the passenger side)
Replace the diff oil
Check/replace gearbox upper and lower boots
Check the brake pads
Grease the caliper slide pins
Adjust hand brake
Replace brake fluid
Check the front wheel bearings/hub for play
Check clutch slave for leaks under the rubber boot
Replace clutch fluid
Get a full 4 wheel alignment by someone who knows what he is doing
Subaru upper cylinder cleaner
Tyres and tyre pressure
Clean the water/top drains

At the end you know all the servicing is done and as each task is completed you will also have a appreciation of the cars condition.

viewtopic.php?f=18&t=46863&p=588886#p588886

To which he adds:

My list above was provided for a car of average use and I believe still valid as an initial baseline.

To add to the list for a low Km older car I would be cautious of anything made of rubber as previous mentioned.
This includes the brake system (master and callipers) and the clutch system (master and slave) as the seals may have perished through lack of use.
I'm not saying to go out and replace them, regularly check them for any sign of leakage or unusual feel.

Also check:
Suspension bushes and steering/driveshaft boots.
Seals around the rear lights.
The rain rail and roof drains.

Ideally get it up on a hoist and spend some time looking for issues underneath then drive it for a couple of thousand Km and check it again.

thanks a lot for yr help man. just wondering is oil filter is the same as fuel filter and my car can do an average of 300km is there any problem?? so i need to change the fuel filter and spark plug in order to know whether it will be fix it or not??

[93_Clubman]

just wondering is oil filter is the same as fuel filter and my car can do an average of 300km is there any problem?? so i need to change the fuel filter and spark plug in order to know whether it will be fix it or not??

Fuel filter is different to oil filter & is toward the rear driver side of RHD NA & NB.

You need to change three things: spark plug leads, spark plugs, & fuel filter for starters.

[koolfan]

just wondering is oil filter is the same as fuel filter and my car can do an average of 300km is there any problem?? so i need to change the fuel filter and spark plug in order to know whether it will be fix it or not??

Fuel filter is different to oil filter & is toward the rear driver side of RHD NA & NB.

You need to change three things: spark plug leads, spark plugs, & fuel filter for starters.

i see~~ and after that it should be fixed?

[93_Clubman]

The list I use for my NA8:
check/ replace engine oil, oil filter, & sump plug crush washer (every 6 months)
check/ replace gearbox oil, including turret (every 2 years)
check/ replace differential oil 75W-90 (every 2 years)
check/ flush/ replace brake fluid (every 2 years)
check/ flush/ replace clutch fluid (every 2 years)
check/ flush/ replace coolant in radiator & expansion tank (every 2 years)
clean/ replace air filter (every year)
replace fuel filter (every 2.5 years/50k kms)
check/ clean/ replace 4 sparkplugs NGK BKR5E-11 (every year)gap=1.1mm
check/ replace spark plug leads
check & clear ECU codes by disconecting battery
check/ clean/ adjust idle screw 850RPM +/- 50RPM
check/ adjust timing - 10 degrees BTDC
check/ adjust throttle cable freeplay 1-3mm
check/ clean throttle body & fuel injectors
check/ clean MAF element
check/ clean PCV valve
check/ clean restrictor operation
check throttle position sensor
check/ replace O2 sensor
check evaporative system
check/ clean cold start pipe fittng & connections
check fuel lines & hoses
check/ adjust/ replace alternator belt 4PK885 - new / used belt: 8-9mm / 9-10mm deflection with moderate pressure
check/ adjust handbrake
check/ adjust clutch pedal freeplay
check/ adjust brake pedal freeplay
check/ adjust front & rear wheel alignment
check/ adjust wheel balance
check/ adjust wheel nut tightness
check/ fill washer bottle level
check/ adjust/ replace tyres & pressures
check/ replace wiper inserts (annually just prior to Winter)
check/ replace front & rear brake pads, grease caliper slider pins & machine discs as necessary
check/ replace timing belt (every 100k kms)
check/ replace waterpump (best replaced in conjunction with timing belt)
check/ clean power window switch contacts
check/ tighten hardtop latches securing screws
check/ clean inside front lower quarter panels
check/ clean windscreen cowl drains & ventilation intake
check/ clean soft-top drains & drain pipes, as well as sill drains & front windscreen frame rubber side drains
check/ clean battery terminals & under battery tray for rust
check/ clean underbody
check/ clean boot, especially boot floor & arms for water or rust
check/ clean engine bay
check/ clean interior, especially parcelshelf & floorpan for water or rust
check/ clean/ polish exterior
check cooling system
check/ replace inner & outer gearshift boots & gearshift base collar/ cap
check brake lines, hoses & connections
check clutch line, hose & connections, including slave cylinder
check/ adjust/ replace front wheel bearing freeplay
check engine mounts
check steering operation & gear housing
check steering linkages, rack guide & tie rod ends
check front & rear suspension ball joints
check/ tighten bolts & nuts on chassis & body
check/ replace driveshaft dust boots
check tighten exhaust system heat shields
check/ tighten exhaust manifold bolts & nuts
check/ replace damper dust boots
check/ replace fuel pump wiring harness top tank connection
When present:
check/ adjust/ replace AC & PS belt - new/used AC belt 8-9mm / 9-10mm deflection with moderate pressure
check/ adjust/ replace powersteering fluid & lines
check adjust/ replace automatic transmission fluid

[93_Clubman]

i see~~ and after that it should be fixed?

As in life generally, there are no guarantees.

[koolfan]

i see~~ and after that it should be fixed?

As in life generally, there are no guarantees.

Got it~~ but I just don't want to waste a lot of money which couldn't fix it... Just wondering is 300km need to use 40 litre is normal or once I change the fuel filter it will improve a lot?

[93_Clubman]

I just don't want to waste a lot of money which couldn't fix it...

Know what you mean, but it depends how you look at it. Preventative maintenance, within reason, is rarely wasted, & you could just as easily 'waste money' trying unsuccessfully to identify the problem by simply replacing old items with new by way of troubleshooting, which is how many do it if they already have access to the spare parts, which I'm assuming you don't.

With the information you've provided, it's unlikely that anyone on here can be absolutely certain about the cause of the issue that your MX5 is experiencing. That said, someone will probably identify the right cause, but the issue then becomes knowing who's call is right. Perfect information is elusive.

[93_Clubman]

Just wondering is 300km need to use 40 litre is normal or once I change the fuel filter it will improve a lot?

I doubt changing the fuel filter will significantly improve the number of kms you're getting out of a tank. But if the fuel filter hasn't been changed in a while, & they do tend to get overlooked, changing it could improve how your car runs.

Is 300 kms from 40 litres normal? Depends how you calculated that; depends how you drive; depends where you drive; depends on traffic conditions at the time you drive; depends how efficiently your NA8 is running, ie what condition it's in & if it's recently been fully serviced; depends if your NA8 is standard or modified; depends on quality of the fuel you're using.