no start condition (scope graph)

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Jan 22, 2012 | 02:03 PM

#16

rla2005

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From: Kentucky

Your DVM values for the PIP sound good. The difference in values from manually grounding and the letting the PIP do it's job are significant. You have a path to follow, IMHO.

Jan 22, 2012 | 02:06 PM

#17

rla2005

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From: Kentucky

Double post....

Jan 22, 2012 | 02:06 PM

#18

maro0078

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From: Slovakia

Quote:

Originally Posted by rla2005

Your DVM values for the PIP sound good. The difference in values from manually grounding and the letting the PIP do it's job are significant. You have a path to follow, IMHO.

I am on good way, but don't know where to go now..
What else could have so strong influence to TFI grounding quality ? does PCM so ?

Feb 26, 2012 | 02:21 PM

#19

maro0078

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From: Slovakia

now, my engine is started. Idle is ok, but when try to rev, looks like come cylinders are not working:

IMG 02691 - YouTube

slow throttle - revs up, fast throttle to wot - starts to shake...
pressures are all between 115 and 125 psi. Changed almost all parts: spark plugs, injectors, dizzy, TPS, spark plug cables....
No power under load, what to look now at ?

Feb 26, 2012 | 02:47 PM

#20

Blue Rebel

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From: Cottage Grove, WI

Sounds like you have a missfire, double and triple check your spark plug wire routing make sure you have the wires routed to the correct cylinders.

Feb 26, 2012 | 02:53 PM

#21

maro0078

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From: Slovakia

they are sure correct. Misfires are present only when I fast open throttle, when very slowly - no misfires.

Feb 27, 2012 | 12:07 AM

#22

rla2005

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From: Kentucky

Fuel pressure?

Feb 27, 2012 | 12:47 AM

#23

maro0078

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From: Slovakia

40-45 psi, I have a gauge on the dashboard.

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Feb 27, 2012 | 09:43 AM

#24

rla2005

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From: Kentucky

Should be in the 30-38 psi range with the engine running at idle and the vacuum hose connected. 40-45 PSI with the vacuum hose disconnected or with the Key On/Engine Off.

Did you ever go back and check the grounds at the engine block, passenger side fender and on the radiator support?

Blue Rebel mentioned plug wires and routing. It is just as important to make sure the wires are routed correctly as well as on the correct plugs.

Use this for reference to prevent cross-fire: Spark Plug Wire Routing for '94-up 5.0L & all 5.8L

Feb 27, 2012 | 01:44 PM

#25

maro0078

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From: Slovakia

Thanks for tip, I will check the cables routing.
Question is, why during slow free acceleration engine rev up normally, but at fast open of throttle it starts to shake and misfiring.