Engine runs rough on cold startup after new spark plugs installed

Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.

SwellSpy

Member
Joined
Nov 3, 2021
Posts
6
Reaction score
0
Location
Florida
Hi all, got to the bottom of this and the news is not good. It turns out the thermostat was shot so the coolant level was not being regulated. This, in turn, led to the engine overheating and I blew a head gasket which is why it was running like hell.
Land Rover dealership quoted me $15,800 to fix it and of course, I will not be taking it there, but the incompetent mechanics locally seemed to miss this issue entirely. Hopefully, I can get out from under it after it gets fixed and sell it. This truck has been a bit of a lemon and unfortunately, I'm all out of lemonade.
 

M32H32IS

Full Access Member
Joined
Feb 8, 2022
Posts
175
Reaction score
60
Location
Texas
Hi all, got to the bottom of this and the news is not good. It turns out the thermostat was shot so the coolant level was not being regulated. This, in turn, led to the engine overheating and I blew a head gasket which is why it was running like hell.
Land Rover dealership quoted me $15,800 to fix it and of course, I will not be taking it there, but the incompetent mechanics locally seemed to miss this issue entirely. Hopefully, I can get out from under it after it gets fixed and sell it. This truck has been a bit of a lemon and unfortunately, I'm all out of lemonade.

Wow, sorry for the unfortunate news. I’m in the same boat with my LR4 currently undergoing an engine swap.

Question: have you ever replaced the coolant crossovers?

How many miles on your Rover?
 

ktm525

Full Access Member
Joined
Mar 26, 2017
Posts
2,608
Reaction score
1,273
Location
alberta
It ran ok before you swapped plugs. You swapped plugs and it did not run well. Now the finger is being pointed at a thermostat and overheat? Something seems fishy or info missing.
 

djkaosone

'11 LR4 HSE LUX 5.0L V8
Joined
Oct 26, 2015
Posts
1,018
Reaction score
690
Location
SoCal
Before you believe the mechanic that doesn't have the proper tools to test, I would suggest doing a couple of things to check if it's really your head gasket before dropping $15k on a used motor.

Easiest way is to combustion test it,
. Compression test to somewhat narrow it down.
 

Latest posts

Members online

Forum statistics

Threads
36,247
Posts
217,851
Members
30,491
Latest member
DonnaRocket
Top