Anyone can help please
Thread Starter
7th Gear
Joined: Apr 2022
Posts: 7
Likes: 0
From: Lebanon 🇱🇧
Anyone can help please
Hello friends
The horsing power of my car dropped from 720 hp to 300hp. I have a misfire i changed the coil and wire from msd And i got a new spark plugs with gap.
After, the scanner showed that the oxygeen sensor needed to be replaced so I changed it too.
I have put my car in dyno, there was no misfire seen in the dyno
But the sound of the exhaust while I drive my car is still showing that there is misfire in my car and no power.
Ps:
The afr is 11 or 11.5
My engine sound is good
my car has not shown any alert check engine on the dashboard
The horsing power of my car dropped from 720 hp to 300hp. I have a misfire i changed the coil and wire from msd And i got a new spark plugs with gap.
After, the scanner showed that the oxygeen sensor needed to be replaced so I changed it too.
I have put my car in dyno, there was no misfire seen in the dyno
But the sound of the exhaust while I drive my car is still showing that there is misfire in my car and no power.
Ps:
The afr is 11 or 11.5
My engine sound is good
my car has not shown any alert check engine on the dashboard
Moderator emeritus
Joined: Jun 2001
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From: Jacksonville Florida BWO Dayton, Cincinnati, Bloomsbury NJ, Cincinnati
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Ahso! You replaced the coils with MSDs. Do you still have the stock coils? If yes, then I'd put them back on to see if the issue is the coils.
IF you have that large a loss of HP, I'd think you'd get a CEL for engine miss.
The heavy tech guys will help on this.
IF you have that large a loss of HP, I'd think you'd get a CEL for engine miss.
The heavy tech guys will help on this.
Last edited by eboggs_jkvl; Apr 16, 2022 at 09:43 AM.
Thread Starter
7th Gear
Joined: Apr 2022
Posts: 7
Likes: 0
From: Lebanon 🇱🇧
Race Director
Joined: Mar 2001
Posts: 19,965
Likes: 6,769
From: Bonneville Salt Flats
I don't know about the fuel-pump, but I can second swapping-in the stock coils. Over the years I've had problems with a number of aftermarket ignition parts on several high-performance applications, and found going back to OEM solved the problem... every time. Very aggravating and disappointing, I might add. All the best, in any event.
Thread Starter
7th Gear
Joined: Apr 2022
Posts: 7
Likes: 0
From: Lebanon 🇱🇧
I don't know about the fuel-pump, but I can second swapping-in the stock coils. Over the years I've had problems with a number of aftermarket ignition parts on several high-performance applications, and found going back to OEM solved the problem... every time. Very aggravating and disappointing, I might add. All the best, in any event.
my car is good in idle and the engine run smoothly
but when the full throttle and high rpm i have misfire and loosing power
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Le Mans Master
Joined: Apr 2001
Posts: 5,475
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From: Black Forest CO
If you have access to a set of stock coils, I would swap those in, and see if the problem goes away.
Drifting
Joined: Mar 2022
Posts: 1,397
Likes: 801
From: Indiana
Just because you have a code for an O2 sensor does not mean the sensor is bad. It could just as easily be a bad connection, a bad wire, could be in the canbus system. Same goes for the misfire. If the engine has been out and the wiring messed with, this could likely be your problem. You need someone who knows how to read a PICO scope and chase electrical gremlins, not a code reader.