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Discussion Starter #1
It idles ok.
Has new electronic control module,distributor
cap and rotor,ignition control module,spark
plug wires,spark plugs.
Pickup coil and coil test ok.
No check engine light or codes displayed.

what's wrong with it?
 

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How many miles on the engine??? Since it's an IROC, I'm going to assume TPI. I'd pull the connectors off the injectors (one at a time) and measure the resistance with an ohm meter. Anywhere from 14.0 or greater ohms would be acceptable. Anything below that would more than likely need replaced. But keep in mind that an ohms test isn't the only way to diagnose a bad injector. An injector can have a good ohms reading, yet have a bad spray pattern or balance. The only way to test these two parameters would be to send them in and have them tested.

Have you also checked fuel pressure? This can also cause what feels like a misfire. Low fuel pressure can be from a clogged filter to a weak pump.

You can also test the MAF sensor by tapping lightly on it with a screwdriver while the engine is running. Any change in the runnability while performing this may be cause for a bad MAF sensor.

Just remember, these are all "backyard" tests but can hopefully lead you in the right direction.

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67 Camaro LS6 454/TH400/12bolt 3.73
1989 TransAm 5.7L WS6 W/all the options
 

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Re-check your plug wires making sure they're going the right cylinder.

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Robert Yates for President!!
 

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Cardude has good Ideas, also the EGR valve may be stuck open. Tap it with a mallet also. Depending on the mileage, my gut instinct says injectors.
 

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under what throttle conditions does it miss?
Part throttle or full.
What about after 2000, it runs fine?
any other details?
David

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67 RS 327
69 Camaro Vintage Racer
65 Lola T-70 Can Am Vintage Racer
 

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Discussion Starter #6
<BLOCKQUOTE>quote:</font><HR>Originally posted by davidpozzi:
under what throttle conditions does it miss?
Part throttle or full.
What about after 2000, it runs fine?
any other details?
David
<HR></BLOCKQUOTE>

Problem is only between idle and 2000rpm.

Thanks to all for your suggestions.
We are trying these out.

Yvonne Maree
Aussie artist residing in the USA http://www.yvonnemaree.aussie.com.au http://www.paintingsdirect.com
 

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Discussion Starter #8
Originally posted by cardude:

Have you also checked fuel pressure? This can also cause what feels like a misfire. Low fuel pressure can be from a clogged filter to a weak pump.

It was a bad fuel pump


Thank you for your help!
 
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