Several times have I seen people complaining/mentioning/claiming that one of the 420 Modena's flaws is that its engine lacks torque, especially low end torque. So, if you had a 420 Modena, would you do any engine swap, or would you simply do some tunning, or would you do nothing at all with the engine?
By the way, since we are talking about the 420 Modena, what are your likes and dislikes in it?
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Re: 420 Modena engine swap
It's an amazing car, I've never heard anyone complain about its power- and during the summer, I am at the track with them all the time. I work with a couple of guys who race their 420 challenge cars, 420 spyders and modenas, and no compaints whatsoever. What would you swap the engine with? lol There are basically no mods you can do to the car- or most Ferraris for that matter.
For the price of an engine swap, just get the tourque-filled 575.
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Code 303 is a miss or lack of power on cylinder 3. If you know for a fact that cylinder is getting spark it could be an injector problem.
Code 420 means the catalytic converter is not performing up to standard which could be several things including the miss on cyl 3.
Well, at least someone else is having the same problem! I have had this problem occur 4 times in the last month, and have reported it to the dealership. Naturally, they can\'t find anything wrong, and if they can\'t duplicate the problem they can\'t repair it! I complained so much about the their lack of concern, that the service manager called GM and they claim NO ONE else had ever reported the problem with the later model Malibu\'s. I mean, come on! My Cobalt had this occur numerous times and the dealership finally replaced the defective parts. Why can\'t GM admit they have an overall problem with their ignitions? Geez........
Why do you people not even mention WHICH engine it is?
Anyway, on 4-cyl 2.5 L it is on the right side of the engine block (as seen from the driver's position ok?, you need to remove several accesory belts, alternator and a cover and you will see it.
You need to find out if any internal engine damage has occurred before you repair or replace anything. If it checks out ok & you decided to make the repairs, by all means replace the water pump and tensioner pulleys at the same time. The 2.7 litre engine had several flaws. Excessive engine sludge buildup that has led to complete engine failure, is well documented. I hope this helps, reply back if you need further assistance.
You could have an enefficient converter. Question is what caused it to go bad? I have attended seminars on code 420, Possible causes are lack of spark or clogged fuel injectors. there have been times where the spark plug wire lays on the engine and over time it wears a weak spot in the side of the wire, its not enough to throw a miss fire code but it keeps the full amount of spark from getting to the plug and not burning the all the fuel in the cyl. A leaky injector would also cause to much fuel to be deliverd into the cyl and not get burned.
What engine? Remember, the life of any engine will depend on how well & often it is maintained, like regular oil changes etc. I've seen engines with an excellent reliability record, blow, due to neglect from lack of oil changes etc. I've also seen engines with a terrible history last a long time because they were well maintained.