help fast out of time

4

4.6rx7

New Member

May 11, 2006

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Feb 27, 2007

#1

• Feb 27, 2007

• #1

ive got sparkto the plugs hold 40psi fuel pressure fuel gettin to plugs tries to start but wont when it does it backfires through th tb then sometimes when stop cranking it rotates backwards put in a new timing chain set to try nd fix but didnt

 

8

86bluecobra

Advanced Member

Dec 20, 2004

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Feb 27, 2007

#2

• Feb 27, 2007

• #2

sounds like your timing is out. Is this a 5.0L? i was looking at your name and 4.6 in a rx-7 seems kinda cool.

 

4

4.6rx7

New Member

May 11, 2006

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Feb 27, 2007

#3

• Feb 27, 2007

• #3

yes its a 5.0 i sold the 4.6 rx7 timing gears are lined perfect and dis is on #1

 

8

86bluecobra

Advanced Member

Dec 20, 2004

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Feb 27, 2007

#4

• Feb 27, 2007

• #4

Is it on #1 cylinder of the compression stroke? It is so easy to get these things 180 degrees out. I would try rotating 180 degrees.

 

Modular2v

Founding Member

Jun 30, 2002

3,222

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99

oklahoma

Feb 27, 2007

#5

• Feb 27, 2007

• #5

86bluecobra said:

Is it on #1 cylinder of the compression stroke? It is so easy to get these things 180 degrees out. I would try rotating 180 degrees.

Click to expand...

hit the nail on the head....i bet its 180 out!

 

4

4.6rx7

New Member

May 11, 2006

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Feb 27, 2007

#6

• Feb 27, 2007

• #6

just ran out and fliped dis 180 justcranks turned it back and cranks let off key it backfires through tb and tries to run backwards

 

8

86bluecobra

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Dec 20, 2004

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Feb 27, 2007

#7

• Feb 27, 2007

• #7

OK what firing order did you wire it for? Is there a possibility you wired like a standard 302 and not a 302 H.O.?

 

4

4.6rx7

New Member

May 11, 2006

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Feb 27, 2007

#8

• Feb 27, 2007

• #8

it is a standard 302 not ho

 

8

86bluecobra

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Dec 20, 2004

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Feb 27, 2007

#9

• Feb 27, 2007

• #9

OK so you wired it 1-5-4-2-6-3-7-8?

 

4

4.6rx7

New Member

May 11, 2006

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Feb 27, 2007

#10

• Feb 27, 2007

• #10

yes

 

8

86bluecobra

Advanced Member

Dec 20, 2004

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Feb 27, 2007

#11

• Feb 27, 2007

• #11

OK backfiring through intake could indicate a intake valve not closing. what is this engine in?

 

Modular2v

Founding Member

Jun 30, 2002

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oklahoma

Feb 27, 2007

#12

• Feb 27, 2007

• #12

your timing could also be retarded! Do you have a rocker adjusted to tight where it might not be letting the valve close all the way?

 

8

86bluecobra

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Dec 20, 2004

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Feb 27, 2007

#13

• Feb 27, 2007

• #13

Can you give us a little more info on the engine? efi or carb? etc etc etc.

 

Modular2v

Founding Member

Jun 30, 2002

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oklahoma

Feb 27, 2007

#14

• Feb 27, 2007

• #14

im assuming its fuel injected since its backfiring throught the throttle body.......what distributor do u have? New wires? cap?rotor?

 

8

86bluecobra

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Dec 20, 2004

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Feb 27, 2007

#15

• Feb 27, 2007

• #15

Modular2v said:

im assuming its fuel injected since its backfiring throught the throttle body.......what distributor do u have? New wires? cap?rotor?

Click to expand...

lol good catch. I just finished working 4 12 hr graveyards. I'm a little slow on the uptake.

 

4

4.6rx7

New Member

May 11, 2006

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Feb 27, 2007

#16

• Feb 27, 2007

• #16

its a 88 tbird it ran god but had a pulsing idle so i did a basictune up and cleaned the iac when started ther was banging sound so we shut it off not to start again lenty of fireand gas but no start

 

8

86bluecobra

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Dec 20, 2004

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Feb 27, 2007

#17

• Feb 27, 2007

• #17

could the banging noise have been a piston coming in contact with a valve?

 

4

4.6rx7

New Member

May 11, 2006

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Feb 27, 2007

#18

• Feb 27, 2007

• #18

how if it was never out of time

 

8

86bluecobra

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Dec 20, 2004

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Feb 27, 2007

#19

• Feb 27, 2007

• #19

well you stated you changed the timing chain. Was it skipping teeth? Why did you change it?

 

4

4.6rx7

New Member

May 11, 2006

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Feb 27, 2007

#20

• Feb 27, 2007

• #20

i changed it because after the tune up when it wound not start and al this happened i thought it had jump time but after dissassembly it had not and since it was apart anyway i replaced it