Not Enough Power & Rough Idle

[ambasad0r]

Guys I have some problem with my nissan exalta.

Last day kasi pina ayos ko yung car dahil nag ooverheat due to leaking head gaslet. So pinapalitan ko yun then after that okay na wala na yung leak at di na nag ooverheat. Upon testing for a drive napansin ko pag naka naka engage yung gear ( 1,2,D or R) parang nanginginig sya. When going to full stop parang mamamatay yung makina kasi ang lakas ng vibration. Kaya ginagawa ko nilalagay ko sa N kapag nag ffull stop.

Another one is himuna yung hatak ng sasakyan lalo na pag paakyat kailangan i floor yung gas para maka akyat.

Need you help mga sir. Before ko kasi pina service yung car di naman ganito.

[1D4LV]

anong car?
have you had your maf and throttle body cleaned?
spark plug changed?

[madduck]

pacheck mo din ang timing sir, baka mali ang position nung ibinalik yung distributor.

[ghosthunter]

Guys I have some problem with my nissan exalta.

Last day kasi pina ayos ko yung car dahil nag ooverheat due to leaking head gaslet. So pinapalitan ko yun then after that okay na wala na yung leak at di na nag ooverheat. Upon testing for a drive napansin ko pag naka naka engage yung gear ( 1,2,D or R) parang nanginginig sya. When going to full stop parang mamamatay yung makina kasi ang lakas ng vibration. Kaya ginagawa ko nilalagay ko sa N kapag nag ffull stop.

Another one is himuna yung hatak ng sasakyan lalo na pag paakyat kailangan i floor yung gas para maka akyat.

Need you help mga sir. Before ko kasi pina service yung car di naman ganito.

Check all the following:
-Ignition timing
-compression test the cylinders (potential back job if it fails this)
-Spark plug
-Spark plug wires
-throttle body cleaning
-air filter
-fuel filter

By the way, how long was your car in the shop when you had the engine overhauled? Does the gasoline smell bad (stale fuel).

[ambasad0r]

Thanks for the reply guys. Have the problem fixed by this morning. Here's the story:

Binalik ko yung sasakyan sa auto shop and complain about the problems. the mechanic which is also the owner quickly figured out the problem which is my spark plug. Sabi sakin luma na daw yung spark plug ko. Pero sabi ko kakapalit ko lang nung last month. Then sabi niya yung dalawa bago pa daw pero yung dalawa matagal na. That makes me think kung pinalitan ba talaga lahat ng plugs ko dun sa last PMS ko GoodYear which i paid for 4 spark plugs. But after a while the mechanic changed the 2 spark plugs which he says luma na. Then asked me to test drive if okay na nga. After nun okay na ulit yung takbo ng kotse ko at di naman ako sinigngil dun sa kinabit niya na spark plug.

Hmmm naisip ko siguro pinalitan nga nung mekaniko yung plugs ko ng iba. Haiiz.

[lorkan1209]

mga sir, question, napansin ko nung nag drive ako pataas after nung nsa flat surface na biglang kumakadyot ung makina, tas nung nasa parking area, after ko e switch off/start un engine ayaw ng mag start. kimain lang kme ng mga 30-45 minutes pag start nag ok na sya, tumawag ako ng mechanic sabi baka daw pasira na ang fuel pump. sa fuel pump kaya ang problema nun? and nagpa change ako ng timing belt last january 31, meron kse oil leak kaya ayun nabasa un timing belt ng langis kaya need na daw palitan, pag ba pinalitan ang timing belt automatic din po ba na maayos na yun? nakita ko din kse habang inaayos nung mekaniko meron cla inaadjust pag kinakabit ung timing belt. thanks mga sir, sana po matulungan nyo ko......

[1D4LV]

mga sir, question, napansin ko nung nag drive ako pataas after nung nsa flat surface na biglang kumakadyot ung makina, tas nung nasa parking area, after ko e switch off/start un engine ayaw ng mag start. kimain lang kme ng mga 30-45 minutes pag start nag ok na sya, tumawag ako ng mechanic sabi baka daw pasira na ang fuel pump. sa fuel pump kaya ang problema nun? and nagpa change ako ng timing belt last january 31, meron kse oil leak kaya ayun nabasa un timing belt ng langis kaya need na daw palitan, pag ba pinalitan ang timing belt automatic din po ba na maayos na yun? nakita ko din kse habang inaayos nung mekaniko meron cla inaadjust pag kinakabit ung timing belt. thanks mga sir, sana po matulungan nyo ko......

possible fuel pump nga.
yung sa timing belt, hindi naman ata kailangan palitan pagka ganun, kung hindi pa manipis. ilang kms na ba tinakbo nung oto mo?

Possible signs of a failing fuel pump:

1. The Engine Sputters at High Speed
The most common early sign of a problem with a fuel pump comes when driving a vehicle at a consistent high speed. While traveling down the road, the car will run well for about 10 miles and then begin to jerk around, or sputter, for a mile or two before returning to normal.

What This Means
Many people will mistakenly diagnose a sputtering vehicle as one with "dirty" gas or some other fuel-related issue. And while that can be the case, it is not uncommon for a fatigued fuel pump to create this same symptom as it struggles to supply a constant stream of fuel to the engine at the proper pressure. The loss of pressure causes the engine to sputter.

2. Vehicle Loses Power While Accelerating
The feelings generated by this second symptom are very similar to the first. However, rather than experience a sputtering sensation while driving, vehicles will experience it upon acceleration from a stop. Generally, the vehicle will initially move before making noises and jerking around as if it will stall. Then, it will continue on its acceleration path smoothly.

What This Means
The process of acceleration creates an increased demand for fuel by the engine. A malfunctioning fuel pump, again, cannot maintain the required pressure to deliver this fuel in a steady manner, thereby causing the engine to improperly mix fuel and air and lose power. Once pressure is restored, the engine is able to run smoothly and the car takes off.

3. Sudden Loss of Power When the Vehicle Is Under Stress
A car or truck is put under stress when the work needed to complete an ordinary task, such as forward movement, is somehow hindered by external forces. Generally, this occurs when climbing a hill or when hauling a load. If, when completing these tasks, the vehicle loses power, cannot accelerate, or begins to sputter, the fuel pump is a possible culprit.

What This Means
Generally, a fuel pump, even an aging one, can maintain a steady stream of fuel and pressure when operating under normal conditions. However, once put under stress, the weakening elements of the pump will begin to take control and the fuel delivery will not be able to keep up with its demands, leading to power loss.

4. Surging
The opposite effect of the above symptoms, surging, can also be a sign of a malfunctioning fuel pump. A car that surges will be moving along normally at a consistent speed. Then, with no driver intervention, will pick up and "surge" forward, as if the gas pedal had been depressed.

What This Means
This is something that many people will mistakenly blame on the fuel filter since it is not "like" any of the other fuel pump malfunction signs. However, this surge is created because, as a result of age and normal wear and tear, the fuel pump now has irregular resistance within its motor. This creates a situation where the pump cannot draw enough electricity to maintain the pressure needed for steady speeds and may "surge" with a sudden ratcheting up in pressure.

5. The Engine Will Not Start
The final symptom of a malfunctioning fuel pump is also the most severe. Drivers who ignore the signs listed above will all eventually end up here. When a car or truck’s engine will not start as a result of a fuel pump malfunction. Basically, the engine will rev, but it will not catch.

What This Means
When a fuel pump has malfunctioned to the point that the car will no longer start, this means that there is no fuel reaching the engine upon ignition. For that reason, drivers will hear the sparks try to ignite, but there will be no fuel to burn. To diagnose a fuel pump malfunction, check for a blown fuse and pressure in the fuel line (it will be 0).

[CLAVEL3699]

kung ang idle nyo nasa constant 1100rpm at parang hindi nag menor kasi tingin ko hindi namamatay yung radiator fan.

Kasi nung pinatay ko yung aircon biglang nag-overheat nung binuksan ko ulit hindi nag overheat.

Mukhang nakarekta or hindi na talaga namamatay? Kaya ang lakas nang gas nya.