Rep Power: 0

Hey fellas,

So my car shakes and makes boom boom sounds for about 5 seconds only during cold startup (Cold weather) then my car works perfectly. My engine light comes on and off depending on how often I start my engine during cold startup. If I check the OBD scanner when my check engine light is on. It shows Misfire cylinder 1.

I have brand new:
Battery
Alternator
4x Spark Plugs
4x Coil packs
Radiator

I googled and people said it might be a bad fuel injector causing this. Does it make sense? I tried redline fuel injector cleaner twice and it doesn't seem to help.... I'm not a mechanic and I don't want to spend too much money on fixing things especially this old car if I can't pinpoint this issue.

Does anybody knows or has this issue and got it fixed?

Please help.



Thanks.

 
Rep Power: 99

New plugs and coils should rule out anything spark related, but not definitely.

It could be a bad fuel injector, but my guess would be a compression related problem. Do you know how to compression test? Have access to a tester?

 
Rep Power: 0

lol nope, I don't. I don't want to get fuel injectors to fix and still have the issue. it does eliminate one of many possible causes but spending money to get to the core issue on a 2003 honda is not worth it for me right now.

 
Rep Power: 125

How much oil does it burn? That’ll be a good indicator of if your compression is crap or not.

 
Rep Power: 0

It doesn't. My oil level is fine. I checked in the morning before turning on my engine and after normal operating temperature. So that rules out the compression test? That's a good new then.... Can somebody explain how cold startup effects the fuel injector? it doesn't open up properly during cold weather if it's bad?

 
Rep Power: 99

I can't explain what cold weather does to fuel injectors, but I have a theory that won't cost you much...

I know that an EGR valve that is slightly stuck open due to carbon buildup will cause an engine to stumble and sometimes stall. It doesn't really explain the Misfire Cyl #1 code, but it is a very cheap repair (only costs a few dollars for a new EGR gasket and some carb/throttle cleaner). Just remove the EGR and clean the ports real good.

Cleaning the throttle body may help also, and you shouldn't even need a new gasket for that.

I've seen gummed up air/vacuum ports cause engine stumbling issues before.