My car is misfiring and there’s no power to cylinder 4. W...

My car is misfiring and there’s no power to cylinder 4. We have don’t the spark plugs ignition coil and fuel injectors Mechanic's Assistant: Is the power loss consistent, or does it fluctuate? So it fluctuates while drivi...

My car is misfiring and there’s no power to cylinder 4. We have don’t the spark plugs ignition coil and fuel injectors Mechanic's Assistant: Is the power loss consistent, or does it fluctuate? So it fluctuates while driving and in idle it dies Mechanic's Assistant: What year is your Spark? What is a spark? The plugs Mechanic's Assistant: Are you fixing your Spark yourself? What have you tried so far? So my dad is fixing it and he’s work on cars his whole life and has built them. We have replaced the spark plugs and ignition coils and fuel injectors so far

Automotive Expert
Hello, my name is \*\*\*\*\* \*\*\*\*\* to just answer! I will be assisting you with all of your vehicle questions today. I’m really sorry that you’re having this issue and I’m going to help you through it, but please understand that I (respectfully) don't know your skill level or tools you have to assist us to diagnose/repair your vehicle. Also, understand that I can't see, smell, hear or touch the vehicle either, so your patience/understanding is appreciated. Please allow me up to 10 minutes to gather schematics and other pertinent information for this issue. I do not know anything about the fees or charge so please if you have any concerns, direct them to customer service. My aim is to give you the best service possible and to help you. If you have any questions or concerns, please don’t hesitate to let me know. I appreciate your patience and will provide responses as soon as possible. Thank you. **year, make, model, engine size?**

Toyota isis 2006 1800cc
Automotive Expert
ok, I just realized this is an Australian vehicle for which we have no information for here in the states. my apologies. I will open this back up to the others

Automotive Expert
Hi, I' Ron, a different expert. I’m very sorry that you’re having this issue and together, we will get this figured out. I will need your help too because I can’t see, touch, hear or smell anything that’s going on with your vehicle. We may also require some specialized testing tools in order to assist us in diagnosing the problems due to the complexity of today’s vehicles. JA will offer a phone call to you at an additional fee, it’s your choice. Please be patient with my replies, I reply back in question order received. If I send you an attachment, I will tell you, BUT, you will NOT get it on a phone; you must be on a tablet or PC. Please let me know when you are satisfied with my answers too so we can close out your question. Please get the freeze frame data from the codes that are set as well as MODE 6 misfires data. Check cylinder compression with a gauge and check injector pulse with a noid light. Thanks again and all the best:) Ron Please feel free to text me back if you need any more help. Thanks again and all the best:) Ron

We have tested the wires to cylinder 4 and the computer and the earth wire isn’t getting enough current. So we are now looking at getting a new ecu and re do wiring
Automotive Expert
Thanks for the update. Ron

we have learnt it’s not the computer it’s the engine did a air compression test on the cylinder and cylinder 1 is on 75psi and 2&3 are 175 psi and cylinder 4 there is nothing.. what will cause this?
Automotive Expert
Jumped timng6or burnt valves. Going on a service call now, be back later on. Thanks again Ron

What others are asking

Shaking and revving upon startup.
It is normal for the engine to rev a bit higher than normal when a car first starts up. But, after a few seconds it should come back down to normal. In cold weather, it might stay high for a...
Water pump is squealing
The water pump may be the cause, but it may also be the tensioner and pulley. The belt would need to be removed, and water pump pulley, as well as all other pulleys, checked for binding or problems. I recommend...
Transfer case making grinding noise
Hello. A grinding sound from the transfer case on this truck is an indication of an internal chain failure. This happens often on this vehicle. I will typically drain the fluid from the transfer case and see if there is...
Transmission lurches when car shifts from 1st to 2nd and 3rd gear
There are two possibilities. This could be caused by internal wear in the transmission. Fluid level and condition should be checked. If the fluid level is low or smells burnt it may be an indication of an overhaul needing to...
Starter keeps cranking
You have two starter relays. Check and change the starter relay on the inner fender near the battery. Follow the red battery cable to the inner fender relay and this should be your problem. If you are still having trouble,...
Overheating - 2007 Nissan Altima
Hi there. A stuck (closed) thermostat ( will overheat very quickly, in a matter of a few minutes. If a water pump has a broken shaft, so that the impeller is not turning, the failure will look the same, very...
Car makes a "BOING" sound in the back when turning or hitting
You will need to have the rear spring mounts and insulators checked to see if they are worn out and need replaced.
The freeze plug failed and coolant mixed with oil. The tech says because it would be impossible to clean out all the gunk, I need
If the engine was run with coolant mixing with the oil it can damage the internal engine bearings and pistons. If it is severe enough the engine would need to be replaced or the entire engine rebuilt and all parts...
Car Stalls when warm.
If you have not replaced the fuel pump module then this will be the most common cause of the vehicle stalling when hot.