I have a 1990 Wrangler with the 4.2L six carbureted engine. It is set up for under 4000 ft altitiude but I have moved to 5000 ft plus altitude. What do I need to do to set it up for the higher altitude? It does run but won't pass emission tests in Colorado.

Volkswagen Scirocco 3 1.4 TSI 122HP Engine Technical Data Aspiration : Turbo + Intercooler Compression Ratio : Maximum power - Output - Horsepower : 122 PS or 120 bhp or 90 kW @ 5000 rpm Maximum torque : 200 Nm or 147 lb.ft @ 1500-4000 rpm 28 more rows

Volkswagen Scirocco 3 1.4 TSI 122HP Specs

Ford's horsepower for fuel injected 4.9 liter was 150 for 1987. If this is a heavy truck engine it may be carbureted which will be less than 150.

No .

Hi JT, The typical firing order for a straight six is 1-5-3-6-2-4. If this doesn't help let us know the specific engine your working on and we'll help you. Regards John

The crankshaft possitioning sensor will cause a rough idle and a slight miss it should show up on diognastics check.

P0300 = random and multiple misfires. Check your coils and ignition electrics - this is where the fault would appear to be by the OBD fault code displayed. Hope this is of help - good luck.

hi no there is only the ones on the inside the layout should be like this for your one


1 Country of Origin 1 = United States 2 Make J = Jeep 3 Vehicle Type 4 = MPV 4 Gross Vehicle Weight Rating E = 3001-4000 lbs.
F = 4001-5000 lbs. 5 Vehicle Line Y = Wrangler 4×4 6 Series 1 = Sport
2 = SE
4 = Sahara 7 Body Style 9 = Open body 8 Engine P = 2.5L Unleaded Gasoline
S = 4.0L Unleaded Gasoline 9 Check Digit 0 through 9, or X 10 Model Year W = 1998 11 Assembly Plant P = Toledo #2 12-17 Vehicle Build Sequence Six Digit Number

incase the picture did not come out

1 Country of Origin 1 = United States
2 Make J = Jeep
3 Vehicle Type 4 = MPV
4 Gross Vehicle Weight Rating E = 3001-4000 lbs.
F = 4001-5000 lbs.
5 Vehicle Line Y = Wrangler 4×4
6 Series 1 = Sport
2 = SE
4 = Sahara
7 Body Style 9 = Open body
8 Engine P = 2.5L Unleaded Gasoline
S = 4.0L Unleaded Gasoline
9 Check Digit 0 through 9, or X
10 Model Year W = 1998
11 Assembly Plant P = Toledo #2
12-17 Vehicle Build Sequence Six Digit Number

hope this helps.

a lot especially if its california certified.the emmisions label under hood will list all equipmentrequired as well as the vacuum hose routing. if label not available you will need to know engine size/trans type/high or low altitude/ca. or federal.plus fords have calibration codes that split the previously mentioned options into several sub groups. so that little sticker under the hood is essential.

4.2L 6-Cylinder

1. Set parking brake. Shift automatic transmission to Park or manual transmission to Neutral. With A/C off, start engine and attain normal operating temperature.

2. With ignition OFF, connect an ignition timing light and a calibrated, expanded-scale tachometer.

3. Disconnect 4 " and 10 " Hg (CEC System) vacuum switch assembly wire connector (located at top of valve cover). Disconnect and plug distributor vacuum advance hose.

4. Start engine, increase engine speed to 1600 RPM and check ignition timing. Adjust timing to specification listed on Emission Control Information label (if necessary). Tighten distributor hold-down clamp and recheck ignition timing.

5. Turn engine off and remove timing light and tachometer. Connect No. 1 spark plug lead, if disconnected. Unplug and connect distributor vacuum advance hose. Connect vacuum switch assembly wire connector.

NOTE: If timing light has an adjustable advance control feature, turn control to OFF position.

Timing is set per the emissions tag under hood.

9 Degrees Application: With automatic transmission
With Federal emission
16 Degrees Application: With automatic transmission
With high altitude emission


9 Degrees Application: With manual transmission
With Federal emission
9 Degrees Application: With manual transmission
With Federal emission