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Old 10-04-2019, 06:45 PM   #1
Awaffa2003
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Default Stumbling throughout revs

Hey all,

My new to me '80 245 is hard to start and running rough throughout the rpm range. When it does start, I have to feather the pedal to keep in running and while doing so, sometimes I hear what sounds like a door slamming, BOOM from the engine.

Today, it wouldn't even rev past 5k.

I'm thinking of starting with the ignition system, new plugs, wires, cap, rotor, and condenser, possibly a coil, but where's the best place to get these parts? I bought some wires and a rotor from Rock Auto once and the only complaint I had was that the wires were very thin.

That and I don't believe ipd carries the condenser...

Haaaalp.
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Old 10-07-2019, 04:41 PM   #2
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Lol nobody?
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Old 10-07-2019, 04:52 PM   #3
ZVOLV
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Failure to rev is usually a very lean mixture.


Edit- lol
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Old 10-07-2019, 08:49 PM   #4
Fred Gwynne
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Bad mass airflow sensor? Your car sounds like mine when the MAF crapped out. I'm just throwing my thought out there liberally. Have no faith in it.
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Old 10-07-2019, 09:05 PM   #5
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Sounds more like fuel than spark. But that is a big first decision.

1980 is certainly a K-jet without a MAF.

Unfortunately, the next diagnostic test is fuel pressure. The Bosch K-jet system is completely regulated by fuel pressure.

Start here:

http://forums.turbobricks.com/showthread.php?t=289775
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Old 10-07-2019, 09:40 PM   #6
c1800
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It won’t rev past 5000 rpm?
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Old 10-07-2019, 10:40 PM   #7
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Quote:
Originally Posted by TestPoint View Post
1980 is certainly a K-jet without a MAF.
Good to hear. Thanks very much.
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Old 10-08-2019, 09:16 AM   #8
Awaffa2003
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Well crap...I guess the $160 I just dropped on ignition parts won't hurt then. Thanks, I'll start with fueling. I was told by the PO that the fuel pump was swapped with a unit from a Pontiac... I'll buy a stock unit first and go from there.
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Old 10-08-2019, 09:35 AM   #9
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There is well over a $1,000 in fuel system parts . . . rebuilt . . . and the parts cannon is not a good diagnostic tool.

Buy, rent or build a fuel pressure test setup and start there.

Hiperfauto rents a pressure test rig.
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Old 10-09-2019, 08:59 AM   #10
Awaffa2003
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Quote:
Originally Posted by TestPoint View Post
There is well over a $1,000 in fuel system parts . . . rebuilt . . . and the parts cannon is not a good diagnostic tool.

Buy, rent or build a fuel pressure test setup and start there.

Hiperfauto rents a pressure test rig.
Will a Harbor Freight unit do the trick? Usually I love the diy angle, but I realize when the granularity becomes prohibitive...this is my daily

https://www.harborfreight.com/Master...Kit-63727.html
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Old 10-09-2019, 09:07 AM   #11
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I do not see the 8mm and 10mm Bosch banjo connectors nor the valve required for K-jet testing. Did you look at the thread link I posted above?

http://forums.turbobricks.com/showthread.php?t=289775
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Old 10-17-2019, 01:04 PM   #12
Awaffa2003
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I did, but the link is bad for the pressure gauge.

My dude, most of the links are bad lol!!! I had to get a ride to work this morning!

Last edited by Awaffa2003; 10-17-2019 at 01:10 PM.. Reason: The struggle
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Old 10-17-2019, 02:16 PM   #13
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Covert to LH 2.4. It is only 4 wires.
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Old 10-17-2019, 05:13 PM   #14
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We all get old. Here is a new link to a pressure gauge. ACE Hardware probably has one also in the plumbing department.

https://www.ebay.com/itm/BRAND-NEW-1....c100005.m1851
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Old 10-17-2019, 08:47 PM   #15
Awaffa2003
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What I want to do is rebuild and Megasquirt my b23 but oh well. Maybe over the winter.

And thank you!
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Old 12-13-2019, 07:39 PM   #16
Awaffa2003
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Update!

I threw the wagon in the shop on the 6th of November and up to this point, the mechanic has done largely nothing. Frustrating, but I don't doubt the quality of his work, I think he could have just been a bit more upfront about the timeline. ANYWAY, I'm taking the car back tomorrow and you guessed it, he says fuel pressure is a likely suspect. I'm back to square 1.

The mechanic did say that there way be a problem with the cold start circuit and offered to rig up a momentary switch in the dash, but I declined. I want this to be stock or upgraded from stock. How do I start diagnosing this issue aside from testing for fuel pressure? Firing the parts canon is awful tempting, I was saving to get the car out of the shop so I have the cash, what would get this damn thing squared away!?!
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Old 12-13-2019, 08:47 PM   #17
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Quote:
Sounds more like fuel than spark. But that is a big first decision.

1980 is certainly a K-jet without a MAF.

Unfortunately, the next diagnostic test is fuel pressure. The Bosch K-jet system is completely regulated by fuel pressure.

Start here:

http://forums.turbobricks.com/showthread.php?t=289775
Quote:
There is well over a $1,000 in fuel system parts . . . rebuilt . . . and the parts cannon is not a good diagnostic tool.

Buy, rent or build a fuel pressure test setup and start there.

Hiperfauto rents a pressure test rig.
Still sounds like a fuel problem. We are not going to be much help until you can provide some fuel pressure numbers.
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