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Old 05-09-2016, 03:41 PM   #1
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1991 25' Airstream 250
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Parts required for a good tune up

Hi all,

Martin has kindly agreed to parcel up some parts for me and ship them over to England (thanks Martin!) so that I can give Cosmo a good tune up. She has been running a little bit rough since we de-winterized her last month, so I want to try and replace many of the items which can cause poor engine performance. I've bought some new leads, a new EGR pipe, TBI gasket replacement set, intake manifold gasket set, HEI, knock sensor. I have a fuel filter and new fuel pump so will get those fitted.

Should I go the whole hog and get a new distributor, EGR valve etc. I don't mind buying some stuff if it leaves me with a spare (the stock parts), but I don't have the cash to go really mad. The unit (Airstream 250 7.4L TBI 4L80E) has been rock solid over the past eight years, but many of the items look like they have been there since new, so I am thinking it is time for some upgrades.

What else do you guys think I should be buying as good service parts? What would be your must buy parts if you were in my position (5000 miles away in Oxford)?

thanks in advance
Nick
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Old 05-09-2016, 04:04 PM   #2
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Oxygen and MAP sensors.

I seriously doubt that you would need to replace the intake manifold gaskets, those should never go bad. Exhaust gaskets are a different story!

Did you use anything like SeaFoam to clean the fuel system? If not I would suggest doing so on an annual basis.
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Old 05-09-2016, 04:13 PM   #3
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Ignition coil, if you don't replace the distributor.
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Old 05-09-2016, 04:36 PM   #4
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Brad - would blown exhaust manifold gaskets impact performance?

Thanks both
Keep em coming!


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Old 05-09-2016, 05:43 PM   #5
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Parts required for a good tune up

Sparkplugs, ignition wires, distributor cap, distributor rotor, air filter, pcv filter, fuel filter, radiator hoses, fan belts.

Carry a spare ignition pickup coil and a module (if applicable for your application) to have just in case.

If a manifold gasket is really really blown out there is a remote possibility that you can warp a valve....

I would fix the manifold gasket because I hate the sound of a blown exhaust gasket.


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Old 05-09-2016, 05:50 PM   #6
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Quote:
Originally Posted by Boom Sounds View Post
Brad - would blown exhaust manifold gaskets impact performance?

Thanks both
Keep em coming!


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I don't know how much it would impact performance but you should certainly hear a change in the exhaust sound. I have heard (but don't know if it's true) that if the leak is bad enough you can burn the exhaust valves. If someone has a definite answer to that question I'd like to hear it!

Brad
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Old 05-10-2016, 07:32 AM   #7
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Hi all - does anyone know iif those Oxygen sensors were California Emissions specific? My coach was a Cali coach, but I'm not sure the VIN lookup is clever enough to sort this out.
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Old 05-10-2016, 08:26 AM   #8
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Hi all - does anyone know iif those Oxygen sensors were California Emissions specific? My coach was a Cali coach, but I'm not sure the VIN lookup is clever enough to sort this out.
Nick, according to the information I can find only one oxygen sensor was used and it's a one wire (non-heated) sensor.

ACDELCO AFS21 {Click Info Button for Alternate/OEM Part Numbers}
GM Original Equipment Info One of our most popular parts
Fits Center; EXCEPT LEADED FUEL EMIS EXPORT (NM8); PRE CONVERTER)(TYPE # 21)
Or Upstream; EXCEPT LEADED FUEL EMIS EXPORT (NM8)


Upstream means in the exhaust manifold or before the catalytic converter (if equiped).

I don't think you can go wrong buying an ACDelco AFS21.

Brad
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Old 05-10-2016, 11:11 AM   #9
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Thanks Brad


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Old 05-11-2016, 12:35 PM   #10
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Thanks for all the feedback. This is my final list of items to tune-up/improve performance on my rig. Any last thoughts on additional items before I place my order? many thanks! Nick

Platinum Spark Plug
GM Original Equipment Ignition Distributor Cap
ACDelco D470 Professional Ignition Distributor Rotor
ACDelco D503A Professional Ignition Coil
GM Original Equipment Ignition Control Module
ACDelco D1987 Professional Ignition Distributor Pickup
ACDelco OEM PT166 Ignition Coil Connector Pigtail
ACDelco EP386 GM Original Equipment Electric Fuel Pump Assembly
ACDelco-TS7-Original-Equipment-Strainer
ACDelco TS1 GM Original Equipment Fuel Pump Strainer
ACDelco 213-1165 Professional Oxygen Sensor
ACDelco PT2313 Professional Multi-Purpose Pigtail
ACDelco 213-1545 GM Original Equipment Manifold Absolute Pressure Sensor
ACDelco CV774C GM Original Equipment Positive Crank Ventilation (PCV) Valve
ACDelco 24205853 GM Original Equipment Automatic Transmission Pressure Control Solenoid Valve Filter
ACDelco D1505B GM Original Equipment Headlamp Switch
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Old 05-11-2016, 12:36 PM   #11
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Please note that these items have already been purchased:

ACDelco 9628H Professional Spark Plug Wire Set
ACDelco 213-92 GM Original Equipment Ignition Knock (Detonation) Sensor
REBUILD KIT GM TBI THROTTLE BODY 220
ACDelco 10181398 GM Original Equipment Intake Manifold Gasket Kit
TRU Vision TV5-20 20" Heavy Duty Blade Assembly
OEM GM TUBE ASM C CASE VENT
Pacific Dualies 18100 Max EZ Air 7-Inch Braided Stainless Steel Valve Stem Extension Kit
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