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Posted: 10/24/2016 12:07:07 PM EDT
[#1]
Quoted:
Yes, I know the problem is obvious... it's a Chrysler. But it's not mine, and I'm trying to help my Dad out. At low speeds driving through the subdivision, the car feels like I'm tapping the brakes. It keeps losing power. It's got 120k on it, and my Dad told me he never changed the plugs. So I did that over the weekend. I got in the car to test it out afterwards, and I floored the throttle. He revved up and down like I was hitting and releasing the throttle. I took it to Autozone to get scanned. It's throwing no codes. After the car warms up, the problem largely goes away. I'm thinking it's maybe a vacuum hose or maybe the EGR valve? Coils,......I am betting |
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Posted: 10/24/2016 12:09:30 PM EDT
[#2]
Quote HistoryQuoted:
Coils,......I am betting Quote HistoryQuoted:
Quoted:
Yes, I know the problem is obvious... it's a Chrysler. But it's not mine, and I'm trying to help my Dad out. At low speeds driving through the subdivision, the car feels like I'm tapping the brakes. It keeps losing power. It's got 120k on it, and my Dad told me he never changed the plugs. So I did that over the weekend. I got in the car to test it out afterwards, and I floored the throttle. He revved up and down like I was hitting and releasing the throttle. I took it to Autozone to get scanned. It's throwing no codes. After the car warms up, the problem largely goes away. I'm thinking it's maybe a vacuum hose or maybe the EGR valve? Coils,......I am betting Are you talking about the coils in the rubber boots that go to the plugs? I know they can burn the boot if they go bad. I didn't notice anything wrong with them when changing the plugs. |
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Posted: 10/24/2016 12:45:56 PM EDT
[#3]
Quote HistoryQuoted:
Are you talking about the coils in the rubber boots that go to the plugs? I know they can burn the boot if they go bad. I didn't notice anything wrong with them when changing the plugs. Quote HistoryQuoted:
Quoted:
Quoted:
Yes, I know the problem is obvious... it's a Chrysler. But it's not mine, and I'm trying to help my Dad out. At low speeds driving through the subdivision, the car feels like I'm tapping the brakes. It keeps losing power. It's got 120k on it, and my Dad told me he never changed the plugs. So I did that over the weekend. I got in the car to test it out afterwards, and I floored the throttle. He revved up and down like I was hitting and releasing the throttle. I took it to Autozone to get scanned. It's throwing no codes. After the car warms up, the problem largely goes away. I'm thinking it's maybe a vacuum hose or maybe the EGR valve? Coils,......I am betting Are you talking about the coils in the rubber boots that go to the plugs? I know they can burn the boot if they go bad. I didn't notice anything wrong with them when changing the plugs. I am not sure if that is coil over plug. You describe what seems to be a coil going bad. Surging is from lack of or too much of: Fuel Air Spark. Fuel MAY throw a code. Air the same Spark...not so much. |
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Posted: 10/24/2016 12:51:36 PM EDT
[#4]
The car is too new for the vacuum hoses to have rotted to the point of disconnection.
Most likey, somebody monkeying around under the hood disconnected one and failed to re-connect, or just knocked it loose out of abject carelessness. On cars where I've encountered similar issues, the culprit was the line that goes to the vacuum reservoir that serves the accessories during open-throttle conditions. Look for the vacuum reservoir gadget (usually well-hidden low inside the fenderwell) that looks like a cannonball. See http://www.autozone.com/engine-management/vacuum-reservoir/dorman-vacuum-reservoir/439276_122285_13423/ |
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Posted: 10/24/2016 1:47:55 PM EDT
[#5]
Quote HistoryQuoted:
I am not sure if that is coil over plug. You describe what seems to be a coil going bad. Surging is from lack of or too much of: Fuel Air Spark. Fuel MAY throw a code. Air the same Spark...not so much. Quote HistoryQuoted:
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Yes, I know the problem is obvious... it's a Chrysler. But it's not mine, and I'm trying to help my Dad out. At low speeds driving through the subdivision, the car feels like I'm tapping the brakes. It keeps losing power. It's got 120k on it, and my Dad told me he never changed the plugs. So I did that over the weekend. I got in the car to test it out afterwards, and I floored the throttle. He revved up and down like I was hitting and releasing the throttle. I took it to Autozone to get scanned. It's throwing no codes. After the car warms up, the problem largely goes away. I'm thinking it's maybe a vacuum hose or maybe the EGR valve? Coils,......I am betting Are you talking about the coils in the rubber boots that go to the plugs? I know they can burn the boot if they go bad. I didn't notice anything wrong with them when changing the plugs. I am not sure if that is coil over plug. You describe what seems to be a coil going bad. Surging is from lack of or too much of: Fuel Air Spark. Fuel MAY throw a code. Air the same Spark...not so much. This is what they look like: Ignition Coil How can I tell which one is going bad? |
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Posted: 10/24/2016 1:48:33 PM EDT
[#6]
Quote HistoryQuoted:
The car is too new for the vacuum hoses to have rotted to the point of disconnection. Most likey, somebody monkeying around under the hood disconnected one and failed to re-connect, or just knocked it loose out of abject carelessness. On cars where I've encountered similar issues, the culprit was the line that goes to the vacuum reservoir that serves the accessories during open-throttle conditions. Look for the vacuum reservoir gadget (usually well-hidden low inside the fenderwell) that looks like a cannonball. See http://www.autozone.com/engine-management/vacuum-reservoir/dorman-vacuum-reservoir/439276_122285_13423/ I'll look around for a leak tonight. Should I be able to hear any hissing from a disconnected hose? |
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Posted: 10/24/2016 4:13:32 PM EDT
[#7]
Quote HistoryQuote HistoryQuoted:
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Yes, I know the problem is obvious... it's a Chrysler. But it's not mine, and I'm trying to help my Dad out. At low speeds driving through the subdivision, the car feels like I'm tapping the brakes. It keeps losing power. It's got 120k on it, and my Dad told me he never changed the plugs. So I did that over the weekend. I got in the car to test it out afterwards, and I floored the throttle. He revved up and down like I was hitting and releasing the throttle. I took it to Autozone to get scanned. It's throwing no codes. After the car warms up, the problem largely goes away. I'm thinking it's maybe a vacuum hose or maybe the EGR valve? Coils,......I am betting Are you talking about the coils in the rubber boots that go to the plugs? I know they can burn the boot if they go bad. I didn't notice anything wrong with them when changing the plugs. I am not sure if that is coil over plug. You describe what seems to be a coil going bad. Surging is from lack of or too much of: Fuel Air Spark. Fuel MAY throw a code. Air the same Spark...not so much. This is what they look like: Ignition Coil How can I tell which one is going bad? with. meter, check resistance. va uum leak is a possibility too, graba can of crbd cleaner and he,k that too. cheap piece of mind |
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Posted: 10/25/2016 6:32:45 AM EDT
[#8]
guess I would have gone for simpler like the iac or throttle body needing to be cleaned.
unless this surge happens under load and not just at idle. |
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Posted: 10/25/2016 8:33:12 AM EDT
[#9]
I suspect vaccum leak. Disconnect the brake booster hose and attach another piece of hose to it to extend the line. buy a cheap cigar and use it to blow the smoke into the line and the vaccum system. Keep pumping smoke into it until you see smoke coming out of the air filter housing. Have a helper there to find the leaak if any.
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Posted: 10/25/2016 11:16:00 AM EDT
[#10]
Quote HistoryQuoted:
Should I be able to hear any hissing from a disconnected hose? Don't count on it. Another trick is to open the nozzle on your propane torch near any suspected void in the vaccum system while the motor is idling. The motor speed will change when the propane gets sucked into the void. A length of tubing over the nozzle will allow you to direct the propane into tight areas, and without inverting the propane bottle so as to squirt liquid propane into areas where doing so may cause great havoc. The cigar smoke method might work too if it doesn't make you puke all over the engine compartment before you find the leak. |
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