New distributor, now starts hard. 89 7.4 TBI

[8d9SquareCrew]

I recently had a local shop do a tune-up. They replaced the distributor while they were there. Now it will crank and crank and only starts the moment key is turned to run position. It's like no spark while cranking. It seems I should be able to unplug the connector at the distributor and test for cranking voltage, and run voltage. But I don't know which plugs are supposed to have 12 volts. It always started very quickly before this. Thanks in advance for any light anyone can shed on this.

[Shifty]

First, check the firing order.  Second, make sure the distributor is tightened down.  Third, (and the most likely) is the timing is off a few degrees. 

[Chevygold]

Check that you have 12v at the BAT terminal on the distributor in the start and run positions.
Graham

[8d9SquareCrew]

Hi, Great, I will pull it in and check those items. Thanks Guys

[VileZambonie]

Why didn't you take it back to the shop and explain the issue? Sounds like they didn't properly time it.

NOTE: Timing specifications are listed on the Vehicle Emissions Control Information label under the hood. Always follow the Vehicle Emissions Control Information label procedures first before using the following procedure.

PROCEDURE:

Set timing under the following conditions:

 ^  Normal operating temperature.
 ^  Air cleaner installed.
 ^  A/C "OFF".
 ^  Transmission in neutral.
 ^  Disconnect SET TIMING connector (tan/black wire) located in harness close to distributor. DO NOT disconnect 4 wire connector at distributor.
 ^  Connect timing light and adjust as necessary by loosening hold down bolt and rotating distributor.

       Refer to specifications:
Engine 7.4L (454 cid) VIN N .................... Base Timing 4~ BTDC (Manual Trans).

Engine 7.4L (454 cid) VIN N .................... Base Timing 4~ BTDC (Auto Trans).

 ^  Tighten hold down and recheck the timing.
 ^  Stop the engine and connect SET TIMING connector.
 ^  Clear ECM trouble code by disconnecting ECM power source.

[8d9SquareCrew]

Hi, The truck seems to be starting better, wires at coil were loose. The only reason I did not do the job myself is that I am recovering from bypass surgery. Now that I have seen the work that is coming out of this shop now and the prices, I wont go back. I was a little hesitant going in but gave them the work. They did the tune up, trans service, and an alternator. Thanks to everybody here for the help.

[Shifty]

I understand about the health thing, I've been having to sub work out myself, and I hate it, especially when it's  something I've done 100 times.  Good luck on the rehab from bypass...