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I replaced my fuel pump, screen, and regulator which all reside in the fuel tank. Car runs "OK", but is hard to start and the throttle response seems off. I adjusted the throttle cable as well. I removed the fuel rail and inspected the fuel injectors. Soaked the injectors overnight in injector cleaner and then blew out. Replaced all 8 injector O-rings. There's this UFO looking thing on the fuel rail that I took apart and cleaned. Car started right up after I put everything back together for a few miles then went back to hard starting poor throttle response. What is that thing please?

Thanks for any help on this.

 
Rep Power: 517

If the round thing connects directly to the liquid fuel area inside the rail, I'd expect it to be a pulsation damper. Not much more to it than a chamber, diaphragm, and spring IIRC.

You replaced the fuel pump, why?
What is the fuel pressure now?
What does the fuel pressure do when you punch the gas pedal?

Any codes?
What is the ECT reading on a scanner datalist, is it accurate?
What is MAP voltage at hot idle, in neutral, all loads turned of?
Fuel trim values now?

Camshaft hasn't jumped time?

 
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it is your fuel pressure regulator ..a lot of times it is what has failed...NOT the fuel pump ..

 
Rep Power: 185

Umm, no, it's NOT a fuel pressure regulator. It's a pulsation damper (as ezone pointed out) used to regulate the oscillation of fuel caused by the injectors opening and closing and smooth this out.

The fuel pressure regulator is part of the fuel pump assembly.

 
Rep Power: 517

Seems to me he is saying the FPR is the OPs' problem, he's not saying that's what the part is in the pic above. (OP says it was replaced though.)



Again, this could be easily proven or disproven with a simple fuel pressure test....
Wait a sec....Silly me, I forgot how we roll here





I'm the azzhole again!

 
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I'm starting to think I jumped a tooth.

How hard is it to change out the timing belt. I attempted to do it a year ago then chickened out when I got to having to remove that big sprocket. I didn't have the tool, so I just put it all back together. Belt's never been replaced. I'm at about 187,000 miles now. I have the Haynes book I got from Autozone. Where can I get that sprocket tool?

Renting one would be better!

 
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My two cents:

1) Buy a service manual. Haynes has better pictures and just enough content to get yourself in trouble.
2) Check the fuel pressure? Why not just check it and put that one to bed?
3) Check the battery (IMO).
4) Timing belt should be changed if you have gone that many miles without a new one - you are gambling with your engine. Change camshaft seal, water pump, crankshaft seal, and other belts when you do it. If I can get the pulley bolt off, anyone can. Tons of people on this site that can help guide you through it. Also, look up ericthecarguy timing belt on youtube.

https://www.civicforums.com/forums/3...d-amateur.html

Oh yah - rent the pulley tool at Autozone

 
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go to youtube and search Eric the car guy ..and briansmobile1 they both have a
couple of nice videos on changing timing belt and water pump